Samsung does not see the SIM card, what to do - step-by-step guide to solving the problem [2019]

First of all, a telephone is a means of communication, and only then a multimedia player, a tool for surfing the Internet, a camera, etc. And if the smartphone does not accept SIM cards, its main function will not be available. Problems with SIM on Samsung Galaxy can arise for various reasons. Some of them can be eliminated on your own, while others require more professional intervention. Let's look at why Samsung doesn't see the SIM card, and what to do in a particular case.

Causes of failure

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Every user of modern phones may encounter this situation. In order to solve this problem, it is necessary to understand in what case this happens.

There are two options for such a breakdown:

Problems with the smartphone hardware;
Software malfunction.

In this article we will analyze all possible faults.

If reboot fails, turn off your phone

If the SIM card error is due to a software issue, sometimes a simple reboot is all that is needed to resolve the issue. Press and hold the Power button until the Restart option pops up. Click on it to restart your phone.

This can solve a lot of problems, but lately, users are increasingly reporting that a reboot is not enough to fix the “SIM card not detected” error, and even a reboot can cause the “SIM card not detected” error. The solution may be to turn off the phone (waiting 30 seconds) and then restart it.

If this solves your problem, you should stick to the procedure of turning your phone off and then on instead of rebooting until an Android update or carrier settings update is released to resolve the issue.

Problems with smartphone hardware

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Why doesn't my phone see the SIM card?

Make sure your SIM card is working. If you have not used this card for a long time, your mobile network operator may have turned it off.

If you are used to carrying your phone in your pants pocket and get caught in the rain, it is possible that moisture or water will get inside the phone. This may be the reason why the phone may not see the SIM card. Just dry your phone.

The next reason why the phone does not see the SIM card is the temperature difference: if you are outside and go indoors, condensation may form under the back cover of the phone.

If you buy a new smartphone, it may be flashed for a specific cellular operator. Your phone will not be able to detect other SIM cards and you will need to go to specialists to reflash your device.

Mechanical damage:

Rust or oxidation of contacts;
Accumulation of dust;
Phone falling;
Poor contact connection;
Damage to the SIM card chip (maybe if you unsuccessfully trimmed the SIM card);
Poor contact between the SIM card and the card reader.

Most often, your phone does not see the card due to a malfunction of the card itself or a broken slot. In order to test this version, you need to insert another SIM card into your gadget and see if it works. If yes, then the problem is in the phone itself.

Remember the moment after which the SIM card was no longer detected. Maybe you updated your device? Or do you have a smartphone with two cards (one of which “does not work”)?

To check this, go to the settings menu of your phone and in the “Manage SIM cards” section, click enable the second one. To check, send a message of any content to any number; if the SIM card is turned off, the gadget will automatically ask you to turn it on, confirm and rejoice.

Enabling SIM card

Message not sent? Do not worry.

We perform all the same actions with the device on one card. You can check whether the card itself works using another phone, insert a SIM card into it and see, if not, then contact your operator’s service center and purchase a new one with the ability to save the number (absolutely all cellular network operators provide this service).

It happens that you accidentally turned on airplane mode on your gadget, check in the settings, if this mode is turned on, turn it off.

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Damaged NVRAM

NVRAM is a part of the memory on Android, into which information about the IMEI code, SIM cards, etc. is entered when you first use the phone. Due to incorrect flashing, this file may be damaged or even deleted. As a result, the functionality of the device is impaired, including in terms of SIM recognition.

What to do . There are two ways to find out that NVRAM is lost:

Connect to Wi-Fi, after which the network “NVRAM warning err=0x10” will be detected.
Dial the combination *#06#, as a result of which the message with IMEI will not arrive.

You can restore this part of the memory from a backup copy or using special utilities. To work with a backup, it is necessary, firstly, that one has been made, and secondly, that you have root rights (full administration rights). Sequencing:

Open the recovery application (see below);
Connect the device to the computer;
Activate root access;
Select “Restore” and follow the system instructions.

There are a great many utilities for restoring NVRAM, they are available for free download on the Internet. These include TWRP Recovery, SP Flash Tool, MTK Android Tools, ADB. Instructions for using them can be found on the websites that provide these applications.

Software fault

Let's take a closer look at specific errors for Android and iOS devices.

Why doesn't my Android phone recognize the SIM card?

The reasons why the phone does not see the SIM card are related to the damage to the IMEI number.

NVRAM is damaged (Incorrect IMEI). This situation occurs quite often on smartphones and you can check it as follows:

Turn on Wi-Fi and check for available networks to connect to;
If the first network that appears in the list of available connections is “NVRAM WARNING: Err = 0x10” or something similar, then NVRAM .
We dial the combination *#06# on the call keypad and see empty fields under the name IMEI 1 and IMEI 2;

What is IMEI? This is a special identifier for your phone, without which you will not be able to make calls or send messages. It is located in NVRAM.

The reasons are as follows:

Incomplete or interrupted firmware process;
Memory re-allocation;
Formatting the gadget via SP Flash Tool;
Using the wrong version of SP Flash Tool.

Repair IMEI using SP Flash Tool

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In order to return your phone to working condition, you must perform the following steps in order:

Charge your phone, install the necessary drivers and download the SP Flash Tool

Click on , select the scatter file from the official firmware.

SP Flash Tool

A window will open. You must select EMMC_User . In a text editor, open the scatter file from the firmware and find the NVRAM .
Copy the value of linear_start_addr to and, after double-checking the entered data, press .
Turn off the smartphone and remove the battery (if this is not possible, wait a couple of minutes), then connect it to the computer while it is turned off; if the work is done correctly, a window with a green checkmark will appear.

SP Flash Tool

Disconnect the phone from the computer and view the saved file as described in point 4.

Recovery via the engineering menu

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The main advantage of this recovery option is that you do not need to download additional programs and there is no need to connect to a personal computer. Be sure to write down your IMEI number before starting this method. You can find it on the packaging box or under the phone cover.

The following steps must be completed one after another:

Open your phone and enter the following combination: *#*#3646663#*#*.
You will see two items: Phone 1 and Phone 2. Open Phone 1.

Don't forget to put a space after AT+.

The same steps must be done with the second slot, just select “AT+EGMR=1.10,” your IMEI number.
Reboot the device and check the IMEI using the *#06# command.

IMEI restoration is also described in detail in this video:

The phone may not see the SIM card after the update. In order to fix this, you need to do the following:

Reflash the device via computer;
Install a patch for communication via TWRP Recovery;
Perform a factory reset.

Don't forget that your smartphone takes time to load drivers and SIM card indicators.

If the new phone does not see the SIM card, then most likely this is due to a manufacturing defect (check all SIM cards that you have).

But don't despair, there are ways to solve this problem:

Without loss of the warranty period (reset the settings to factory settings, take them to a service center or issue a return (exchange) of the product to the store);
With loss of warranty (reflash or replace the card tray at the nearest workshop).

If your gadget freezes completely or partially, some applications do not work correctly, or a constant error is displayed, you need to do a hard reboot of the smartphone and then restore it to factory settings.

Role of Recovery

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To enter it you need to use a certain key combination. Often, this program can be launched by pressing and holding the volume down and power keys simultaneously.

Restore to factory settings

If you use the phone for a long time and actively, the software may malfunction (the so-called glitch). Productivity may drop due to a backlog of errors.

The easiest way to solve this situation is to restore Android to factory settings. This can be done through the settings menu, select the item and press . After these steps, the system will return to its original settings.

Be sure to back up all your data before resetting to avoid losing it.

To be able to recover after a factory reset, you need to synchronize with your Google account.

Go to the menu, activate it and just check the box. After this, all your data and information from all applications will be duplicated to your Google account. Thus, to restore all data, you will need to enter your account login and password.

To avoid failures during downloading, use a stable high-speed Internet connection (for example, Wi-Fi). In this case, the system settings will remain factory settings.

If you have forgotten the password for your account, then the password recovery page will help you. Follow the instructions there.

Well, if you forgot your username, use the username recovery page. In this case, you need to remember the backup email address or phone number to which the page is linked.

We also looked at the problem specifically for some popular brands (Meizu, Xiaomi, Samsung).

Why can't my Meizu phone see the SIM card?

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China's 3G Internet is different from our WCDMA/HSPA, for this reason it is not surprising that in China there are no problems at all with the World Wide Web.

Not long ago, the netmonitor - according to its logs - the 3G Internet may freeze at the moment when your mobile phone can change the base station. It can be either free or close. While in one place, your smartphone can register in both one and another station. As a rule, there are 8 cells connected, everything is in motion.

Therefore, one of the reasons why the Meizu phone cannot see SIM cards is that the communication module is broken or damaged.

In most cases, this is due to a malfunction of the hardware (SIM card, slot):

Dropping the phone or getting wet; Poor contact of the SIM card;
The chip is damaged;
Problems with the SIM card and card reader (these problems can arise if the SIM card does not fit tightly enough);
Moisture gets into the phone;
It happens that you buy a gadget at a promotion or cheaper than its nominal value and the seller did not tell you that the phone is firmware for a specific cellular network operator (in this case, SIM cards from other communication providers will not be recognized by your device, and you will not be able to fully use the smartphone).

As for the software of this smartphone model, it is slightly different from those that we described. Often it is enough to disable unnecessary frequencies in the engineering menu. To do this, dial the following combination on the call screen: *#*#3646633#*#*

Go to “BandMode” / “SIM1” . Next, uncheck the following:

Don’t touch LTE Mode, otherwise the IMEI will be lost!

If you have poor 3G speed, try leaving bandmode only in GSM mode, DCS-1800, UMTS mode, WCDMA-IMT-2000.

If the SIM card for the Internet is in the first slot, then only the frequencies in the GSM Mode item will be available for BandMode/SIM2.

Don't forget to restart your phone.

Why can't my Xiaomi phone see the SIM card?

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The main reasons are:

Mechanical breakdowns
Poor contact.
Broken chip - as a result of poor SIM card cutting
Poor contact of the SIM card in the card reader.
“Chinese” phone – does not support national mobile cellular operators.

To install you need to have TWRP . This program allows you to completely restore the firmware from a recovery file, removes all “hidden” factory files and ensures full operation of your smartphone in the likeness of a personal computer, which makes the process of loading and “revitalizing” a “dead” phone much faster without launching the program itself.

TWRP

Let's look at how to install this program.

First you need to download the application.

We agree with all permissions, especially root access . Select installation on your device and download. Select a file. image and put it through the button.

After this installation, your phone will start in Recovery from which you can perform the necessary actions.

Why can't my Samsung phone see my SIM card?

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What should you do if the Samsung phone you recently purchased no longer recognizes the SIM card and, as a result, you cannot make calls? What do you need to do with your Samsung phone to make your SIM card from your mobile operator work again? Let's try to figure it out.

There are main failures due to which Samsung phones cannot see SIM cards:

Hardware

Oxidation of telephone contact;
Microcircuit failure;
Breakdown or damage to the telephone board;

Software failure

Incorrect operation of the software.

The surest way to identify a hardware problem is to insert another (new) SIM card. If the other (new) SIM card is not visible, then the problem is in the phone. Try checking your phone for dirt and water. If everything is clean and the device is otherwise functioning, then this is a hardware failure and it is better to contact a service center.

It is not recommended to repair Samsung smartphones yourself. In this matter, a qualified master is needed.

To eliminate a software failure, you need to do a hard reset or reflash.

You can see how to carry out this procedure in this video:

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Why doesn't my iOS phone see the SIM card?

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Oxidation of contacts.
Poor contact connection.

Try removing and reinserting the SIM card.

Chip damage.

Quite often it happens if you cut the SIM card yourself and did not replace it with a new one.

Poor contact between SIM card and card reader.
Gadget glitch.

In this situation, the first thing to do is to reboot the phone.

The new phone requires activation.

This can be done without a SIM card using the Internet, computer and iTunes. Just connect via USB cable and go through the activation process.

SIM card integrity.

Remember that iPhone only works correctly with new maps.

Reflashing the phone.

To do this, you need to download and install the latest version of iTunes.

Go to - [your name] - iCloud and turn off the option.

iTunes

If after all these steps your gadget still does not see the SIM, then contact the service center, since the breakdown may be serious and you cannot figure it out on your own.

8.5Total Score Phone does not recognize SIM card

You should not panic if all the methods that we described in our article did not help you. Contact specialists and they will definitely help you. The problem, for example, may be a disconnection of a cable or some wiring.

Relevance of information 9 Availability of application 8 Disclosure of the topic 8.5

There are several reasons why the phone does not see the contacts on the SIM card or the card itself. They can be divided into two groups:

1. Hardware failures, such as:

Oxidation and failure of phone contacts;
Broken microcircuit on the SIM card;
Damage to other internal elements - board or chip

2. Software failure, i.e. malfunction of the software.

↑ System (software) malfunctions

↑ Enabling the SIM card

Just in case, you should check if your SIM card is turned off in the smartphone settings. For this:

Go to settings in “SIM cards”

Click on each SIM card (if you have 2 of them) and activate the disabled one.

Sometimes there is a bug like this: the SIM card is active, but there is still an icon indicating that it is disabled. In this case, we simply send any SMS from the “non-working” SIM card: a request to turn it on will automatically appear, which we must confirm.

↑ Problems with NVRAM

NVRAM on devices with MTK processor is the area where important data is stored, including IMEI. And if it is damaged, then the IMEI is erased, and without it the smartphone will not see the SIM card.

To make a diagnosis we do the following:

Enter the code *06# in the dialer. If instead of IMEI we see empty windows, then the problem lies in NVRAM

Or we turn on Wi-Fi and if a network appears with the name “NVRAM WARNING: Err = 0x10”, then the problem lies in NVRAM.

The solution is very simple: we restore the old IMEI or change it to a new one. How to do this, read in another article.

↑ Problems with SIM after update

Sometimes the phone stops recognizing the SIM card after you have installed the latest firmware update. In this case, it makes sense to “roll back” the updates and return to the previous version in which the SIMs worked properly. You can also reset your smartphone to factory settings, which is described in detail here.

So what to do if your Samsung smartphone stops seeing the SIM card?

The surest way to determine the problem is to try inserting another SIM card. If it works, it means the old card is broken and needs to be replaced. To do this, you need to take your passport and contact the nearest branch of your operator - they will change it immediately and free of charge.

If the new SIM is not visible, then the problem is in the phone. Try checking the contacts on your phone reader for dirt and water. If everything is clean and otherwise the device functions without failures, then most likely this is a hardware failure and it is best to contact a service center. It is not recommended to repair Samsung smartphones yourself; you need a qualified technician.

There are 2 ways to fix a software glitch.

The first is to do a hard reset, in other words, Hard reset. How to do this using the example of Samsung Galaxy is described in this article.

The second method, flashing, is not suitable for everyone, since to implement it you need to have certain skills. In order to reflash your smartphone, you should download the firmware and utilities from the phone manufacturer’s website.

You can find out even more information from the articles:

We hope these tips will help you, and you will be able to set up your SIM card and call your loved ones!

You can ask questions in the comments or on our VK group page.

Access error due to physical damage to the SIM card

1. The most likely reason that the mobile device does not see the SIM card is that the latter has damaged contacts, a broken case or a changed shape. In this case, the card is not seated correctly in the slot and stops working normally.

What to do . In this case, you will have to contact your telecom operator and ask to replace the SIM card.

2. It may turn out that the SIM card is dirty and this affects its recognition by the phone.

What to do . Under no circumstances should you use water or chemicals for cleaning. It is recommended to clean the contacts with an eraser or a cotton swab moistened with alcohol.

3. It happens that the card is intact and not damaged, but it does not fit tightly into the slot. designed for connecting a SIM card.

What to do . To eliminate this defect, simply fold a piece of paper between the SIM card and the back cover in several layers.

Main causes of SIM card problems on Samsung phones

There are a lot of factors leading to the fact that the device does not see or cannot recognize the SIM card. However, all of them can be combined into three groups:

Mechanical malfunctions of the mobile device. They occur when a card is frequently removed/inserted into the SIM slot, the device is damaged as a result of a strong impact, or moisture penetrates under the case.
Problems related directly to the SIM card. May be due to the presence of scratches, chips and other mechanical defects on the printed circuit board, expiration of the SIM card or its blocking by the operator.
Malfunctions of the operating system or installed software. Samsung may not see the SIM card after it is disabled by software, due to the installation of unofficial firmware or by deleting the IMEI number.

Let's consider each of the possible options in more detail.

The third reason why a Samsung smartphone or tablet does not see the SIM card - contacts

The next step is to clear the contacts on the SIM card itself. For this purpose, we reach a 40% alcohol concentration (regular vodka).

There may also be a degreasing liquid - this is the best product for cleaning electronic surfaces.

Simply apply 10ml to an anti-static cloth (avoid paper due to its ability to carry electrical charges) and polish the inside of the SIM card that contains the contacts.

IMPORTANT INFORMATION

If the Samsung stopped seeing the SIM card after a fall, then you most likely cannot do without service, since the module could be damaged.

Mechanical damage to a mobile device and how to fix it

If problems arise with the operation of the SIM card, the first thing you need to remember is whether the phone was exposed to any external influences. So, if you dropped it, there is a possibility that the power amplifier, microcontroller, connector or other module may fail or become unsoldered. In such cases, it is better to contact a service center.

If there are no prerequisites for the Samsung to break down, try the following:

Restart your smartphone. The problem may lie in a single software failure.
Take out the SIM card and put it in another phone. This will eliminate the malfunction of the SIM card itself.
Make sure the card is installed correctly.
Wipe the SIM and connector on your mobile phone with a soft cloth soaked in alcohol. The cause of the problem may be simple contamination or oxidation of the contacts.
Press the SIM card onto the card holder and place a piece of paper. There is a possibility that the SIM card holder has simply become loose.

↑ Hardware faults

↑ Incompatibility of SIM card and phone

For example, you bought a super modern flagship smartphone and inserted a SIM card into it that you have been using for a very long time. There is a high probability that the device simply will not be able to read such a SIM card. In this case, we simply go to the nearest office of our operator and change the SIM card to a new one (the number will remain the same).

↑ Problem with slot and SIM card contacts

If you accidentally wet your smartphone or it was left in a dusty room for a long time, then perhaps the contacts of the SIM slot and the SIM card itself are simply dirty or oxidized. To fix this, just soak a cotton swab in alcohol and wipe the contacts here and there.

Troubleshooting SIM card problems

If you determine that the source of all the troubles is the SIM card itself, it is recommended to act in the following order:

Call your operator's support service and find out if the card has been blocked. This can happen if the SIM card is not used for a long time.
If you installed a new SIM card in your phone, it may not be activated. To activate, you will need to deposit money into its balance.
Visually inspect the SIM card for scuffs, scratches and other defects. If you find them, change the card at the nearest service center of your operator.
If the SIM was left near a magnet for a long time, it could become demagnetized. In this case, you will also need to contact the mobile communications department.

Incorrect code or network settings

1. If you enter the wrong PIN code several times, the SIM card is blocked. You can regain access using a PUK code. However, if it is lost or entered incorrectly ten times, it becomes impossible to unblock the card yourself.

What to do . You will have to contact the operator and provide the owner’s passport details.

2. It happens that the network settings are set incorrectly, as a result of which the SIM card does not catch the network or is not registered in it. This may be the result of a SIM change or network reconfiguration. To debug the settings, you need to contact your mobile operator.

What to do . Any problems that arise when using a SIM card can be resolved by calling the contact center or contacting the service department.

Software malfunctions

If you are the owner of a dual-SIM Samsung and the SIM card is not visible in only one of the connectors, see if the second slot is enabled in the device settings. The required function is located in the “SIM Card Management” section.

There are cases when, after a smartphone is infected with a virus or its firmware is flashed on its own, NVRAM—non-volatile random access memory—is damaged. This is where the IMEI of the mobile device is stored. If you erase it, Samsung will not detect SIM cards.

To fix the problem, you will need to restore the IMEI. This can be done through the engineering menu:

Turn off the device and remove the SIM card from it.
Turn it on, and then use the numeric keypad to enter *#3646633# or *#*#3646633#*#*. After this you will be taken to the engineering menu.
Open the CDC Information – Radio Information section.
Go to the Phone 1 tab and in the top line after “AT+” type EGMR=1.7,”IMEI”. The identifier of your mobile phone is indicated in quotation marks. It can be found under the back cover of the Samsung Galaxy.
Confirm your changes by clicking SEND AT COMMAND.
In the Phone 2 tab, enter the IMEI for the second SIM card. Only in this case, after “AT+” you need to indicate “EGMR=1.10,”.

After restarting the phone, the IMEI will be restored and everything should work. If this does not help get rid of the problem, all you have to do is reset all settings to factory settings or reflash your smartphone via a PC and the Samsung Kies program.

A SIM card is a cellular subscriber identification module. Without its correct operation, operations such as making and receiving calls, sending SMS messages, as well as the full functioning of some applications are impossible. Sometimes the phone may malfunction, refusing to see the installed card of one of the mobile operators. In this article we will look at what to do if a Samsung smartphone does not see the SIM card.

The fourth reason why the Samsung phone stopped recognizing the SIM card - coverage

The very rapid growth of 4G infrastructure and the need for work includes switching off some transmitters.

Your phone may have been in an area disconnected by your operator for some time. In this case, most smartphones automatically connect to another GSM network.

There are several percent chances that your Samsung was out of reach. For this purpose, also try to enable roaming, which allows you to use another GSM network.

If Samsung stopped seeing the SIM card after the reset, then perhaps it is simply not enabled in the settings.

Troubleshooting hardware problems

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This section will present only those methods of solving the problem that you can do yourself at home.

note

If the recommendations do not give the desired effect, you should contact a service center or a specialist for diagnostics and subsequent repairs.

The basic steps to fix a physical breakdown are as follows:

Checking that SIM cards are installed correctly. Perhaps the element was simply installed on the wrong side, which caused the lack of contact.
Testing the SIM card and mobile device. You should install the card in another phone, if everything works fine there, then the problem is in the device, if not, the cause of the problem is in the SIM card. What you have to do when Samsung doesn’t see the SIM card depends on the result obtained.
Troubleshooting problems with your phone involves checking the contacts going to the SIM card. The procedure is feasible provided you have a removable battery. It is necessary to wipe the contacts with alcohol and slightly bend the metal part for a better fit. Also, the culprit of the problem may be a software glitch, which will be discussed below. In all other cases, the smartphone will have to be sent to a specialist for inspection.

There are a number of root causes associated with the incorrect operation of the SIM card. Let's take a closer look at each of them:

Mechanical damage to the element. You should check the SIM card for severe scratches, chips and bends of the microcircuit. If there are any, you will need to contact the subscriber service center for a replacement.
Incorrect trimming. The overwhelming majority of smartphone owners, when switching to a new device, do not want to waste time and contact the operator’s stores, so they change the SIM card format themselves. If the cutting was done inaccurately, this causes the contacts to mismatch and, as a result, the phone does not detect the connected element.
SIM card deformation. A long period of operation and exposure to elevated temperatures can cause slight bending of the plastic, which affects the tightness of the contacts. You should bend the SIM card a little so that the side with the microcircuit is slightly convex. here is not to overdo it, otherwise you can break the element.
Microcircuit contamination. What to do if Samsung does not see the SIM card for this reason? Wipe the metal part with alcohol to remove dirt and other obstructions.

Among the problems related to the SIM card, there may also be those that are not related to mechanical damage:

Shutting down due to prolonged inactivity. Mobile operators disconnect subscriber numbers if the account has not been topped up by any amount within a year. By calling from another phone, you can find out the current status of the number and the possibility of restoring it.
The new card has not yet been activated. Topping up your balance often solves the issue.

Airplane mode solution

If you have tried all the above basic fixes and you are sure that the SIM card is not at fault, it is time to try the Airplane mode solution. Swipe down from the top edge of the display (once or twice depending on where you placed the icon) and turn it on.

Depending on your version of Android, you may or may not receive a warning message when you enable Airplane mode. Turn it on and leave it on for about thirty seconds or so. When you turn it off, your Android device will start searching for the network and hopefully the SIM card error will be fixed .

Troubleshooting software problems

Software problems arise in the smartphone's operating system and can only be solved using drastic methods: resetting to factory settings or flashing the smartphone.

A hard reset can be performed in several ways: through the phone's settings menu or by launching Recovery Mode.

It is important to know

After the procedure, all user data will be deleted, so you should transfer important files to your computer or place them in cloud storage in advance.

Flashing the operating system will require certain knowledge and the use of special programs. If Samsung does not see the SIM card after installing the updates, then you need to search for a previous firmware version that will not have the specified problem. In the future, you should disable automatic updates (at least until another software version is released).

note

If you are not confident in your own abilities or the instructions for installing the OS yourself are superficial, it is better to seek help from a specialist.

Vitaly Solodky

Answers on questions

There is no signal on Samsung Galaxy S6, what should I do?

Install another modem via Odin.

On your phone, go to settings – lock screen and security – find phone and turn off “Activation Lock”
Install and run as administrator Odin
Insert the downloaded modem into the CP field
Connect your smartphone in firmware mode to the PC (Volume Down+Home+Power and confirm Volume Up) and press Start
The modem has been flashed, now there will be no problems.

Modems for Samsung Galaxy S6 SM-G920F here.

Samsung Galaxy S3 does not see SIM card

Wipe the contacts of the SIM card; if that doesn’t help, exchange the SIM card for a new one at your telecom operator’s store.

If all else fails, reflash your Samsung Galaxy S3.

The new phone does not recognize the SIM card

Check all available SIM cards; if none of them want to work, then this is a factory defect. There are several possible solutions to the problem:

Without voiding the warranty:

Reset
Repair at a certified service center
Returning and exchanging a device for a new one

With no warranty:

Flashing
Replacing the SIM card tray in any workshop

The phone does not see the SIM card after flashing the firmware

In this case, the solution depends on the installed firmware and installation method. You can force the phone to see the SIM card after flashing it like this:

Restore the backup of the radio module (if available, you can ask for backup from other users of the same device)
Restore IMEI (if there are empty fields when dialing *#06# instead of IMEI)
Reset settings
Install the stock firmware that was originally installed on the smartphone, make a backup of the radio module and install the required firmware. If necessary, restore the radio module from the old software.

Airplane mode

This is the most common and common factor why a mobile gadget does not detect a SIM card. Perhaps someone activated “airplane mode” in the settings, which led to the disabling of all communication modules. Just look at the top panel (where the time and charge level are) - if the “airplane” icon is displayed there, then the cause of the problem has been found.

Just pull the curtain down and disable this functionality. Or we find the necessary options in the settings:

But I suspect that you checked this option even before viewing my instructions. Therefore, let's move on to the following methods.

By the way, have you tried rebooting the phone? This helps with software glitches.

Try using your phone in safe mode

Unfortunately, not all installed applications work well. Some apps can cause more harm than good and will cause this SIM card error. Boot your device into Safe Mode .

Leave it in Safe Mode for a few hours and see if you still have this problem. If not, try to remember the last few apps you installed and delete them. Exit Safe Mode and see if you still have this problem.

SIM card is disabled by the system

Why this happens is not easy to say. There may have been a glitch or viral interference. Although often someone bad can manually change the parameters. To reactivate the SIM follow these steps:

Go to the settings menu;
Find the item responsible for mobile network options (may be called differently, depending on the Android version and shell type - MIUI, Flyme). I have it displayed like this:

You will see a list of SIM cards installed in your phone, click on the required one and turn it on:

An alternative method: we try to write an SMS message and send it from a card that does not work. In this case, a notification prompting activation will be displayed on the screen:

Unfortunately, users often see an “Empty SIM card” notification, which indicates other reasons. We will consider them further.

Enter your network's APN settings manually

If the above two methods do not work, your SIM card may have completely lost contact with the network it is supposed to connect to. If this happens, you may have to manually enter your network operator's APN settings

At this point, you need to either contact your operator to get the necessary APN settings, or check online to see if they are published on the operator's website.

It may also be a good idea to take a screenshot and save your APN settings in advance so you can quickly refer to them if you run into the problem again.

Why doesn't the phone see the SIM card? It's a hardware defect.

I personally encountered a situation when I bought a new smartphone and cut the card so that it would fit normally into the corresponding slot. But after turning it on, the network was not detected. It turned out that the device was not inserted all the way.

In this regard, you should familiarize yourself with the Nano and Micro standards, which differ in size.

Ideally, at the time of purchase, ask the consultant to prepare your SIM cards for the new device.

None of the above helps - contact the service center. I know of many cases where Samsung phones did not see the second SIM card. And the reason was a manufacturing defect. Repairs at official centers were carried out free of charge.

The author recommends:

Smartphone “does not see SIM card” - how to fix the error

There are various reasons why your Android device is not reading the SIM card. Some possible reasons could be that you inserted the SIM card incorrectly or there is a software problem with your Android device. Whatever the reason, a solution needs to be found quickly when your phone says “SIM card not detected.”

Here are some fixes for when your Android phone can't detect SIM card .

Moisture ingress

Has the gadget been exposed to negative effects of liquid - dropped into water, caught in the rain, etc.? Then the contacts are likely to oxidize (both in the smartphone itself and on the SIM). Try removing the card and wiping it with a cotton swab dipped in alcohol:

Even after repair, the phone does not recognize the second SIM? Most likely, the “specialists” did a poor job and used non-original modules and adapters, which can move with the slightest impact and lead to signal loss.

I would like the methods listed above to help you resolve the problem. Unfortunately, most often you have to contact the service.

06/11/20196:0019283 Victor Felk Information portal IT Technician

Sources used:

https://geekhacker.ru/telefon-ne-vidit-sim-kartu/
https://www.lumias.ru/chto-delat-esli-telefon-samsung-ne-vidit-sim-kartu/
https://poandroidam.ru/samsung/smartfon-ne-vidit-sim-kartu.html
https://mobila.guru/faqsingle/samsung-ne-vidit-sim-kartu-chto-delat/
https://it-tehnik.ru/androids/no-sim.html

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Remove the SIM card and battery

Another basic solution you can try is to remove the battery (if removable) and SIM card from the SIM tray . Before you do this, make sure you have turned off your Android device. After you have removed everything, wait one minute and put everything back in its place.

It is common practice that dropping the phone, even if it is not damaged, can cause the SIM card to become dislodged. A cheap method that many people have used is to add a little paper to make the SIM card fit more tightly.

What to do if the Internet does not work

Reboot your device

If the Internet suddenly stops working, reboot your device. This problem may be due to a failure in connecting to the operator's network, and rebooting will fix it.

Check if the Internet works after a reboot.

If the Internet does not work after rebooting, proceed to the next recommendation.

Turn on the Internet on your device

The Internet on the device can be turned on or off using a special switch. Swipe down from the top of the screen twice, find Mobile data, and make sure the switch is enabled.

If the switch is greyed out, turn it on and reboot your device. Check if the Internet is working. If the Internet does not work after rebooting or the switch was active, proceed to the next recommendation.

Check your internet settings

If the device is new or you changed the SIM card, set up the Internet.

Check if the Internet works after setup.

If the Internet does not work after setup, proceed to the next recommendation.

Select a SIM card to access the Internet

If your device has two SIM cards, check that the correct one is selected for Internet use: open Menu → Settings → Connections → SIM card manager → Mobile data → select a SIM card.

If the required SIM card was not selected, restart the device and check if the Internet is working. If the required SIM card has already been selected or the Internet does not work, proceed to the next recommendation.

How to Fix Galaxy Tab SIM Card Not Detected | does not recognize the SIM card

Are you having a problem with your SIM card not being recognized by your Galaxy Tab A? This troubleshooting guide will help you with steps to narrow down the factors.

Galaxy Tab A SIM Card Not Detected, Fix #1: Check for Errors

If your Galaxy Tab A SIM card is not detected, the first thing you want to do is check if there is an error code or message. If there is, this may help you figure out the reason. Be sure to check if the error has known solutions online. If the problem is caused by an application or software error, other users may encounter the same error. This also means that there is a possibility that someone has already published a remedy or solution that you can follow.

If there is no error at all, continue with the troubleshooting steps below.

Galaxy tab. SIM card not detected. Fix #2. Troubleshoot SIM card problems.

There are a number of direct ways to deal with the SIM card right in this situation. We will discuss each of them below.

Clear the SIM app dialog box cache.

If reinstalling the SIM card fails, you can also work directly with the SIM App Dialog application by clearing its cache. Here's how it's done:

Dialogue application "Reset SIM application".

If your Galaxy Tab A SIM card is still not detected, the next step is to reset the SIM App Dialog app to its default settings. Here's how:

Galaxy Tab. Fix SIM card #3 not detected. Reboot your tablet.

Rebooting your Galaxy Tab A won't hurt in this situation. Be sure to do this if you find that the SIM card is working. Try restarting it normally first by pressing the Power button to access the boot menu. Then select the Restart option and see if that works.

Another way to restart your device is to press and hold the Volume Down button and the Bixby/Power button simultaneously for 10 seconds or until the device screen turns on. This simulates the effect of disconnecting the battery from the device. If this works, it may unlock your device.

If a normal restart doesn't help, try the following:

The second restart procedure attempts to simulate the effect of removing the battery. On older devices, disconnecting the battery is often an effective way to troubleshoot device problems. If nothing has changed, move on to the next suggestions.

Regularly rebooting your device at least once a week can be helpful. If you tend to forget things, we suggest you set your phone to reboot yourself. You can schedule this task by doing the following:

Galaxy tab. SIM card not detected. Fix #4: Wipe. cache partition

If your Galaxy Tab A does not recognize the SIM card after installing an update or app, there may be a problem with the system cache. To ensure that the system cache is in good condition, try clearing the system cache. Here's how:

Galaxy Tab. SIM card not detected. Fix #5: Reset Network Settings

In some cases, simply clearing the tablet's network configuration is enough to solve this problem. Be sure to follow these steps:

Galaxy Tab SIM Card Not Detected Fix #6: Run in Safe Mode

A bad third party app can cause problems with Android or other apps. If the SIM card on your Galaxy Tab A is not detected after installing a new app, you may have a problem with a third-party app. What you want to do in this situation is to confirm that this is the case by restarting the tablet in Safe Mode. While running in safe mode, no third parties can operate. So, if the problem is not present in Safe Mode, then a third-party application is to blame. To restart into safe mode: