The modern smartphone is a repository of confidential information, and protecting access to the SIM card becomes a critical task for every owner of the Xiaomi device. PIN-The code prevents unauthorized use of your number by attackers in the event of theft or loss of a gadget, and many users neglect this feature, relying only on a pattern lock or fingerprint scanner, which is a mistake, because the user is not able to use the device. SIM-The card can be moved to another phone.
With MIUI and the new HyperOS, the protection activation process is as simple as possible and takes only a few minutes. You don’t need special applications or root rights, all the necessary tools are already built into the standard settings menu. In this article, we will discuss the algorithm of actions, examine the difference between PIN and PUK codes, and answer questions that arise when blocking.
Ignoring this security step can lead to financial losses, especially if your number is tied to banking apps. SIM-Cards are the first and most important step in protecting your personal data. Let's get to the practical side and set up the security of your device right now.
Preparation for the installation of protection SIM-map
Before making changes to security settings, make sure you have all the required data on hand.The standard factory code for activating protection is often listed on the plastic card-based card that came bundled with the SIM card when you bought it. If the card is lost, don't panic, as there are standard combinations that are often used by operators by default.
For most carriers in Russia and the CIS, there are universal initial values, for example, for MTS it is often 1111, for Beeline it is 1234, and for Megafon it is 1234 or 0000. However, relying on memory or Internet forums is risky, since operators can change these values. The most reliable way is to find the original packaging or contact the operator’s salon with a passport to recover data.
⚠️ Note: Three times injected infidel PIN-code will cause the lock to occur SIM-map and request PUK-Don't try to guess the combination at random unless you're sure the data is correct!
Also, before starting the procedure, make sure that the battery charge of your Xiaomi smartphone is at least 20-30%. Although the setup process does not require much energy, suddenly turning off the device during changes in security settings can cause a software failure in the communication module.
Step-by-step: activation PIN-code-in MIUI HyperOS
Xiaomi’s shell interfaces may vary slightly depending on the Android version and regional firmware, but the logic of the menu remains the same. First, unlock your smartphone screen and find the Settings icon, which usually looks like a gear, you need to go to the section responsible for connection settings and device security.
The algorithm of actions is as follows:
- 📱 In the settings menu, find and select Passwords and Security (in older versions it may be simply called Protection).
- 🔒 In the list that opens, find the Privacy section or immediately go to the Protection item. SIM-map.
- 📲 Select your SIM card if there are two slots in the device (SIM 1 SIM 2).
- 🔢 Activate the Request Switch PIN-the code, by moving it to the "Included" position".
After switching on the switch, the system will ask you to enter the current one. PIN-If you are installing protection for the first time, enter a standard code received from the operator or specified on a plastic basis. Once successfully entered, the system can offer to change the code to a more complex and unique one, which is a great practice for improving the level of security.
How to change PIN-code
Factory combinations like 1234 or 0000 are highly discouraged, as this is the first combination an attacker will try, and changing the code to personalized is a must-do step after activating the security feature. To do this, in the same menu where you included the code request, you need to find the option Change. PIN-code.
The change process requires you to enter the current combination to confirm that the owner has access to the settings, then you will be asked to enter a new code, usually consisting of 4-8 digits, come up with a combination that is easy to remember, but difficult to guess by others, avoiding obvious dates of birth or sequences.
Write the new code in a safe place or save it in the password manager, because when you reboot your smartphone, the system will ask for it. If you forget the new code, you can unlock the SIM card only through the use of the new code. PUK-code, which is a more complex procedure.
What to do if you forget a new one PIN-code?
Unlocking SIM-map PUK-code
If you or someone else misinformed three times PIN-code, the SIM card will be blocked, and the screen will be required to enter PUK-Personal Unblocking Key is a special unlock key that is issued by the carrier and has nothing to do with the security code, and its main task is to reset the error counter and allow you to install a new one. PIN.
Find it. PUK-code can be in several ways, without contacting the communication salon:
- 📄 Look at the plastic card-based, which came complete with the SIM card (usually designated as PUK).
- 💻 Go to the personal account on the operator's website or in the mobile application (section "Help" or "Settings" SIM").
- 📞 Call the operator’s support service from another number (identity confirmation is required).
Entering PUK-The code is implemented directly on the lock screen, where the system reports the lock. PUK-The smartphone will immediately suggest to come up with and enter a new PIN-Be very careful, you only have 10 attempts to enter. PUK-Ten wrong attempts will lead to the complete destruction of the SIM card, and it can only be restored by re-releasing the operator.
| Parameter | PIN-code | PUK-code |
|---|---|---|
| Appointment | Protection against non-Sancian access | Unlocking after PIN errors |
| Number of attempts | 3 attempts at | 10 attempts at trying |
| Where to find out. | User memory | Basis of SIM, Personal Cabinet |
| The risk of blocking | Temporary lockdown | Full SIM lockdown |
Features of working with two SIM-cards
Xiaomi smartphones traditionally support the installation of two SIM cards, and each of them can have independent security settings. PIN-The codes for the first and second cards, and the different requirements for their request when you turn on the phone. SIM-maps where you need to switch between tabs SIM 1 and SIM 2.
When you turn on a smartphone with two secure SIM cards, the system will consistently request codes for each card, usually asking for the code for the main card assigned to the calls first, and then for the second card. If one card does not require code, the system will immediately go to the desktop after entering the code for the secure card.
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Use the same. PIN-codes for both SIM cards, if possible, will simplify the input procedure when restarting the device and reduce the risk of confusion.
It is important to consider that when you change SIM card slots (for example, if you move them physically), the security settings are stored behind the card chip itself, not behind the phone slot.
Frequent problems and ways to solve them
Users may experience a situation where the menu item for installing the code is inactive (gray) or missing, most often due to the fact that the SIM card is not defined by the system or is in a standby state. Make sure the card is inserted correctly into the tray and the status bar displays network signals. SIM-Maps, security settings will not be available.
Another common problem is the report that "SIM-The card is locked right after you turn it on, even if the code is not entered, and this can happen when you transfer the card from another phone where the protection was turned on, but the code was lost, in which case only the unlock procedure will help. PUK, Don't try to bypass the security software, because you can't do it without the operator keys.
⚠️ Note: If Xiaomi smartphone after entering the correct PUK-The code continues to require it again, perhaps the SIM card is physically damaged or has a critical memory error. SIM-card-card.
Also worth mentioning is the “App Auto Run” feature, which sometimes conflicts with the request. PIN-code-in-old MIUI. If the phone freezes or restarts after you enter the code, try updating the device's software to the latest version through the About Phone menu. The stability of the security module depends on the relevance of the firmware.
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Regularly check the performance of the SIM card and knowledge of your own PUK-This will save you from losing contact at a critical time.