The situation when the smartphone screen suddenly reports that the SIM card is blocked can unsettle even an experienced user. This is especially acute if there is no way to quickly contact an operator or use the Internet. Owners of devices based on Android often encounter different types of blocking, and the success of the entire operation to restore access to communication depends on the correct determination of the cause.
The operator MTS uses several levels of subscriber number protection, each of which requires its own unique approach to the solution. This could be a simple screen keyboard lock, a ban on outgoing calls due to a negative balance, or more serious protection with a PUK code when you repeatedly enter an incorrect PIN. Understanding the differences between these conditions is the first and most important step to returning the phone to working condition without a visit to the communication store.
In this article we will analyze in detail the algorithms of actions for each specific case on smartphones with an operating system Android. You will learn what settings you need to check, where to find the necessary codes, and what to do if standard methods do not work. The main thing is to remain calm and strictly follow the instructions so as not to aggravate the situation by accidentally blocking the SIM card itself forever.
Diagnostics of the type of blocking on the smartphone screen
Before taking any action, you must carefully read the message that the operating system displays Android. The interface may differ depending on the device model - be it Samsung Galaxy, Xiaomi or Google Pixel, but the essence of the notifications remains the same. The “Enter PIN code” error indicates that the phone is simply asking for a standard access code for the SIM card, set by default or previously set by the user.
The message “Enter PUK code” or “SIM card is blocked” looks much more serious. This means that the limit of PIN entry attempts has been reached. At this moment blocking it goes to the level of the card itself, and a regular PIN will no longer help. If you see the message “Emergency calls only” when there is a network signal, the problem most likely lies in the financial condition of the personal account or temporary technical work on the provider’s side.
⚠️ Attention: Never enter the PUK code at random. The attempt limit is only 10 times. After the tenth incorrect attempt, the SIM card will be destroyed programmatically, and the number can only be restored by re-issuing the card at the operator’s office.
It is also worth paying attention to the network indicators at the top of the screen. If instead of the usual icons 4G or LTE a crossed out SIM card or an exclamation mark is displayed, this may indicate a physical problem with the contact or a complete deactivation of the communication service. In some cases, Android may incorrectly display the network status after updating the firmware, so the initial diagnosis should include a simple reboot of the device.
Unlocking if the PIN code is entered incorrectly
The most common situation is that the device asks for a PIN code when turned on. Standard code for cards MTS usually equal to 1111 or 0000 if the user has not changed it previously. If you are sure of the code, but the phone does not accept it, there may be a glitch in the reader or a software glitch in the input interface. Try entering the code slowly, making sure that the CapsLock key is not pressed (although this is not relevant for numbers, it does affect the layout in some shells).
If the code has been forgotten and entry attempts continue, the error counter will increase. A warning will appear on the screen indicating how many attempts are left before it is completely blocked. At this point, it is critical to stop guessing codes. The system Android will transmit this data to the SIM card chip, and after three unsuccessful attempts (up to ten in some models), the request will change to a requirement for a PUK code.
- 🔢 The standard PIN for new MTS cards is often indicated on the plastic backing to which the SIM card was attached upon purchase.
- 🔄 If you accidentally changed the code and forgot the new one, try to remember the combinations that you often use to protect other data.
- 📵 If there are frequent input failures, it is recommended to remove the SIM card, wipe the contacts and insert it back when the phone is turned off.
It is important to understand that PIN blocking is a measure of protection against unauthorized use of your SIM card in another device. If you plan to frequently change phones or sell an old device, the PIN request function can be disabled in the settings. To do this, go to the Settings → Security → SIM card settings section and uncheck the “SIM card blocking” item. You will need to enter the current code once for confirmation.
Write down the new PIN code in a safe place or save it in your password manager immediately after changing to avoid problems in the future.
Unlocking via PUK code: search and introduction
When the screen requires a PUK code (Personal Unblocking Key), the situation becomes more tense, but completely solvable. This code is unique for each SIM card and cannot be found by brute force. Operator MTS provides several legal ways to find out this combination of numbers without leaving home. The easiest option is to find the original packaging of the SIM card, where the PUK is printed next to the PIN.
If the plastic is lost, the subscriber's personal account or mobile application My MTScomes to the rescue. To log into the system, you will need another authorization method, for example, by calling a short number from another phone or logging in using your username and password, if you previously set up access. In the number information section or in the security settings, the current PUK code of your active SIM card is always displayed.
Path to the application menu: Home → Profile → Security settings → PUK codeAfter receiving the code, enter it in the field on the screen phone. The system will prompt you to come up with a new PIN code. Come up with a combination that is easy to remember but difficult for others to guess. You will need to enter your new code confirmation twice. If, after entering the PUK code, the phone writes “Error” or “Invalid code”, double-check the numbers. You may have confused PUK with PIN or made a typo.
| Source of receipt | Availability | Required data |
|---|---|---|
| Plastic carrier card | Only when availability | Physical access to packaging |
| Personal account on the website | Round the clock | Login and password from your personal account |
| Mobile application | Round the clock | Log in using FaceID or password |
| Call support (0890) | During business hours | Answers to security questions |
⚠️ Attention: The interface of your personal account and mobile application may be updated. If you do not find an item with a PUK code in the specified sections, use the search in the application menu or refer to the current help in the “Help” section.
☑️ Algorithm for entering a PUK code
Financial blocking and methods for restoring balance
The most common reason for loss of connection is a negative balance. The operator MTS blocks outgoing calls and Internet access, but incoming calls and SMS usually remain available for some time (the “trust mode” period). In this case, there is no request for codes on the phone screen, but the network icon may show a restriction or be absent altogether if the contract is automatically terminated for long-term non-payment.
To unblock a number in this case, you need to top up your account with an amount that covers the debt and the minimum payment to activate the services. This can be done through the bank application, payment terminals or through the operator’s website. After funds are received, unlocking occurs automatically within a few minutes, but in rare cases, manual re-registration on the network is required.
If the money has been debited, but the connection does not appear, try to forcefully update the phone's registration on the network. To do this, on devices Android you can use airplane mode. Turn it on for 10-15 seconds and then turn it off. The phone will again search for cell towers and send a request to register in the operator’s home network.
- 💳 Check the transaction history in the banking application to make sure that the payment actually went through and did not get stuck in processing.
- 📞 Try calling the toll-free support number (for example, 0890 from an MTS mobile or 8-800-333-0890 from another phone) to check the blocking status.
- 🌐 If the Internet does not work, try sending a USSD request
*100#to check the balance if voice communication is still available.
Sometimes blocking may be imposed not for non-payment, but due to suspicious activity, for example, spam sending from your number. In such a situation, financial replenishment will not help. You must contact the operator through alternative communication channels (chat on the website, social networks) and confirm your identity to remove restrictions.
Automatic unlocking after payment takes up to 15 minutes. If the connection does not appear after 30 minutes, be sure to reboot the phone.
Remote blocking if the device is lost or stolen
If your phone has been lost or stolen, the priority is not to unlock the screen, but to block the SIM card itself so that attackers cannot use your funds or access accounts via SMS codes. The operator MTS allows you to block a number remotely through your personal account or by calling support.
For quick blocking via the Internet, log into your personal account from any available device (computer, tablet, friend’s phone). In the list of your numbers, select the problem one and find the “Block” or “Suspend service” button. This action will instantly stop the SIM card from working in any phone, even if all protection has been removed.
After finding the phone or purchasing a new SIM card while saving the number, the service can be restored. If you lose the card itself, you will need to visit the operator's office with your passport to obtain a duplicate. In this case, the old SIM card will be completely deactivated, and it will no longer be technically possible to unlock it.
⚠️ Attention: Blocking a number through your personal account does not protect the data stored in the memory of the smartphone itself (photos, contacts, files). To protect your information, use the Find My Device services from Google or the phone manufacturer.
Technical failures and resetting network settings on Android
Sometimes the problem lies not in the operator or the code, but in a software failure of the operating system Android. The phone may “remember” the incorrect network state and refuse to receive signals, simulating a blockage. In such cases, resetting the network settings helps. This procedure will not delete your personal files, photos or applications, but will return Wi-Fi, Bluetooth and mobile network settings to factory settings.
To perform a reset, go to the settings menu. The path may vary slightly depending on the version Android and shell manufacturer. Usually this is section System → Additional settings → Reset settings → Reset Wi-Fi, mobile data and Bluetooth settings. Confirm the action, after which the phone will reboot.
What to do if resetting the settings did not help?
If resetting the network settings did not solve the problem, try removing the SIM card and insert it into another phone. If the connection works in another device, the problem is in your smartphone (the slot or antenna may be faulty). If there is no connection there either, the problem is on the side of the operator or the SIM card itself.
It is also worth checking whether the Airplane mode is accidentally activated or whether the function of blocking all incoming calls is turned on in the phone settings. Sometimes users accidentally activate these features through the Quick Access Toolbar by lowering the notification shade. Make sure that the airplane icon is not highlighted, and in the call settings there are no restrictions on all incoming calls.
Before resetting the network settings, write down the passwords for important Wi-Fi networks, since after the procedure you will have to enter them again.
Frequently asked questions (FAQ)
Is it possible to unlock MTS SIM card via USSD command?
You cannot directly unlock the PUK code via USSD command, since you already need an active SIM card to enter the command. However, you can check your balance and activate trust payment services using the command *111*123# (code may change) if the blocking is not complete.
How much does it cost to unblock a number in an MTS salon?
If you need to re-issue a SIM card due to exhaustion of attempts to enter PUK, the service may be paid depending on your tariff plan and region. Replacing a card if lost is also charged. It is better to check the current cost in your personal account or by calling support.
Why does the phone write “No network”, although the balance is positive?
This may be due to technical work on the operator’s towers, incorrect access point (APN) settings, or a physical malfunction of the SIM card. Try rebooting the phone or manually selecting the operator in the network settings.
Is it possible to restore the number if the SIM card is blocked forever (10 PUK errors)?
Yes, the number can be restored, but the plastic card itself cannot be restored. You need to go to an MTS communication salon with your passport. The operator will issue a new SIM card with the same number and tariff. The balance and connected services will be preserved.
Does unlocking the phone screen (pattern pattern) affect the operation of the SIM card?
No, these are different levels of protection. Unlocking the screen gives access to the phone interface, but does not activate the SIM card if it has a PIN code. Conversely, entering a PIN code will unlock the connection, but will not give access to phone data if a screen password is set.