Owners of Xiaomi smartphones often face an obsessive requirement of the system to enter PIN-code SIM-It's a security measure that's embedded in modern versions of the map. MIUI HyperOS is designed to protect users' personal data in the event of device theft, but the constant interruption of the phone to enter code is annoying for most users, especially when the screen is locked in the middle of an important conversation or while using the navigator.
Many people mistakenly believe that it is a system bug or virus, but in fact it is a regular feature of Android, reinforced by the security policies of Chinese manufacturers. The system forcibly requests proof of SIM card ownership so that an attacker cannot use the phone to make calls or receive SMS-And fortunately, this mechanism can be turned off, regaining full control of the device without unnecessary interruptions.
In this guide, we will look at all the available ways to fix this problem, from standard menu settings to the use of engineering codes and ADB. You will learn why the 72-hour interval is chosen by default and what risks it brings to completely disabling this protection. It is important to understand that Xiaomi periodically changes the location of items in the menu, so we will consider the current ways for the latest versions of firmware.
Reasons for request PIN-Xiaomi code
The main reason lies in the requirements of telecom operators and security standards. GSM. SIM-The card contains a chip that stores the encryption keys, and you need to log in to them, and on regular phones, this request only appeared after the device was fully rebooted. SIM-maps" or "Security SIM" The system artificially initiates the reboot of the communication module at certain intervals of time.
The 72-hour (three-day) interval is a standard timer that is set at the firmware level to balance security and convenience. If you don't enter the code during that time, the phone thinks the owner may have lost the device, and locks the communication module. This is especially true for models with two SIM-maps where requests can come randomly for each of them.
Another reason could be a failure in the communication module itself or a conflict of versions of MIUI. After updating the operating system, security settings can be reset to factory ones, where protection is turned on by default, and it is worth noting that some carriers force the security profile on their side, which causes the phone to request code more often than usual.
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If the request appears more than once every 3 days, try extracting and re-inserting. SIM-map, previously wiped contacts with a lastic.
Understanding the nature of this request helps you choose the right method to fix it, so if it's a software lock, you can uninstall it through settings, and if the problem is a physical card or wear, software methods may not help.
Disabling verification through standard MIUI settings
The easiest and safest way to remove the intrusive requirement is to find the appropriate switch in the settings menu, which can vary slightly depending on the version of the MIUI shell (12, 13, 14 or HyperOS), and in most cases, the setting is hidden in the section responsible for passwords and device security.
You need to go to Settings. → Passwords and security → Confidentiality → Special permissions. You should look for the access point. SIM-card SIM. In some regions of the firmware, this item is called "Protection". SIM-"card "SIM If you find a switch like this, just turn it off, and the system will alert you to a security drop, but it will stop asking for the code every three days.
☑️ Algorithm of disabling protection
It is worth considering that in some versions of firmware for the global market (Global). ROM) This item can be hidden or renamed. For example, in HyperOS, the menu logic was reworked, and the settings were redesigned. SIM-Cards are often moved to the Settings section → SIM-maps and mobile networks, carefully study all subsections related to mobile communication.
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Total shutdown of protection SIM-The cards in the settings make the phone vulnerable in the event of theft, as the attacker will be able to use your SIM on another device.
If the standard path didn’t work, your firmware version might not be able to disable this feature through the GUI, which would require more advanced methods, as described below.
Using an engineering menu to reset a timer
For more in-depth configuration of communication options in Xiaomi smartphones, there is an engineering menu. This is a hidden part of the system designed to test equipment, but it also allows you to manage some security parameters. SIM-It is accessed through a special code set in the "Phone" app".
Type ##4636## into your dialer. If the code is suitable for your model and Android version, the Testing menu will open. Select Phone Information. SIM-card (SIM 1 SIM Look for the “Set Preferred Network Type” option or similar settings, but be careful: direct lock timer control is not always available here.
What if the code doesn't work?
A more effective method in an engineering context is to reset network settings. In the Settings menu → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth, you can try to update the operator configuration. Sometimes after resetting and resetting the APN, the lock timer stops activating, as the forced verification flag is reset.
If you're not sure what you're doing, you'd better limit yourself to standard methods. The engineering menu is a powerful tool, but it requires care.
ADB Teams for Advanced Users
If the graphical interface does not give an answer, you can use the toolkit ADB (Android Debug Bridge: This method requires connecting your phone to your computer via a computer. USB-cable and availability of installed drivers. ADB Allows you to send commands directly to the system without interface limitations.
To start, activate the developer mode. Go to Settings → About phone and quickly click on the build number seven times. Then, in the Developer menu that appears, turn on "Debugging on USB." Connect your smartphone to your PC and start the command line or the administrator terminal.
adb shell settings put global sim_lock_timeout 0This command tries to set the lock timer to zero, which effectively disables the check. However, depending on the version of MIUI, the parameter may be called differently.
adb shell settings put secure sim_pin_required 0If the commands are successful, restart the device. Check if the request has disappeared after a while. The ADB method is good because it makes changes at the system variable level that often ignore the standard interface constraints. However, after updating the firmware, these settings can be reset.
Note that on newer versions of Android with SELinux enforcing, some ADB commands may not run without root permissions. If you see a message "Permission denied," then the system blocks the change of this setting without full access.
Comparison of problem-solving methods
To make it easier for you to choose the right method, we have prepared a comparative table of methods, each of which has its advantages and disadvantages depending on your technical background and phone model.
| Method | Difficulty | Efficiency | Risks. |
|---|---|---|---|
| MIUI settings | Low. | Medium | Minimum |
| Engineering menu | Medium | Tall. | Medium (network failure) |
| ADB teams | Tall. | Maximum | High (no root) |
| Replacement of the SIM | Low. | Depends on the operator. | Loss of number |
As you can see from the table, standard settings are the safest way, but it doesn't always work. ADB They give the best results, but they need to be careful. SIM-Cards are an extreme measure that helps if the problem lies in an old card chip that doesn’t support new encryption protocols.
Choose a method based on your confidence in the technology. If you're not willing to risk the stability of your phone, start with the settings. If you're a power user, try ADB.
Effect of the version SIM-card-and-operator
You cannot discount the physical condition of yourself. SIM-Older Mini-SIM cards or early versions of Micro-SIM cropped under Nano may not work properly with modern Xiaomi communication modules. Contacts may oxidize and the chip wears out, resulting in loss of connection and subsequent request. PIN-code when attempting to restore communication.
And some carriers also use specific security profiles that require frequent login, especially for corporate tariffs or virtual carriers, so even resetting your phone won't help, because the request will come back again and again.
⚠️ Note: If the password request appears immediately after switching between 4G and 3G, The problem may be network coverage, not phone settings. In areas of insecure reception, the phone is constantly re-registered on the network, triggering security checks.
It is recommended to contact the salon of your operator for replacement. SIM-new-card (USIM). This service is often free or costs symbolic money, but it ensures compatibility with modern encryption standards and can eliminate the problem of frequent locks.
In addition, check with the operator whether you have an additional service "Anti-Traffic" or "Resale Protection", which may require periodic confirmation.