How to set up a PIN code on SIM-Xiaomi map: The complete guide

Modern Xiaomi smartphones store a huge amount of confidential information, ranging from banking applications to personal correspondence. SIM-The first and most important barrier to preventing unauthorized access to your phone number in the event of a stolen or lost device is a card, without which an attacker can insert your SIM into any other phone and access confirmation codes from banking services.

In the operating system MIUI The security setting process is implemented as conveniently as possible, but many users ignore this feature for fear of getting confused in the settings or forgetting the combination of numbers. SIM-It's not in the phone's memory, so it works even after you've removed the card from the device, making it a critical security element.

In this article, we will discuss in detail all the steps of activating, changing and restoring the security code. You will learn how to properly create a reliable combination, what to do if you forget it, and how to avoid blocking the card using the help of a secure card. PUK-We will look at the nuances of working with two SIM cards and answer the most frequent questions of users.

Why protection is needed SIM-maps on Xiaomi

Many smartphone owners mistakenly believe that the password on the lock screen or fingerprint scanner is enough for complete security. However, these protection methods only work while the device is on and charged. If the phone is turned off or discharged, an attacker can extract the device from the device. SIM-card and insert it into your device, gaining access to your calls and SMS.

This is where the verification mechanism comes into force. PIN-It is requested immediately after the phone is turned on or the card is installed, long before the Xiaomi operating system boots. This means that without knowing the four-digit combination, it will be impossible to use the phone number, which blocks the possibility of obtaining authorization codes from instant messengers and banks.

In addition, activation of protection SIM-The card is useful in situations where you're giving your phone away for repair or for flashing. The service master will be able to diagnose but will not be able to use your SIM for his own purposes. Redmi and Poco fully support safety standards. GSM, Providing reliable encryption of the password request.

Preparation for setting up and search PUK-code

Before you start changing your security settings, you need to make sure you have access to the source data. If you've never changed your factory PIN, it's often the default number of 0000 or 1234, but you'd better double-check it with your carrier, and if you entered the code three times in a row, you'd lock the card.

In this case, it will be necessary to unlock PUK-This is an eight-digit key that is issued by the operator along with the SIM card, usually printed on a plastic card holder, to which the SIM was attached when you bought it, PUK-The code can be found in the operator’s personal account or found out through the support service.

It is recommended to write in advance PUK-code to a secure location, such as a paper notebook or secure password manager, but do not store it in phone notes that may be locked. It is also worth checking the account balance, as some operators may require it to conduct operations through service codes, although this usually does not affect the setting of a PIN through the phone menu.

⚠️ Warning: Never try to guess. PUK-After 10 incorrect attempts to enter PUK-code SIM-The card is permanently blocked and can only be replaced at the office of the operator.

Step-by-step: how to turn on and change the PIN code

The activation process on Xiaomi smartphones is unified for most models running on Android. the interface may vary slightly depending on the version of MIUI or HyperOS, but the logic of actions remains unchanged.

To do this, open the Settings app and find the Application Protection section or go straight to Passwords and Security. Next, select the Privacy category and find the System Security subsection. This is where the management menu hides. SIM-In some versions of the firmware, the path may look like Settings. → Passwords and security → Confidentiality → Special rights of access → SIM-map.

In the menu you will see a list of the SIM-Click on the right one (SIM 1 SIM 2) You will see the PIN Request switch, and when activated, the system will ask you to enter the current code, if you are doing this for the first time, enter a standard code from your operator, and after successful verification, you will be asked to install a new PIN code.

Come up with a combination that is easy to remember but hard to guess, avoid obvious combinations like date of birth or sequence 1234, and once you enter a new combination, you will need to confirm it by re-entering, and from now on, every time you reboot your phone or retrieve the card, your personal code will be asked.

Protection settings for two SIM-map

Xiaomi and Redmi are famous for their support for two physical SIM cards, allowing users to separate work and personal contacts or use tariffs from different carriers.

This means that you can set different PINs for SIM 1 and SIM 2. For example, you can install complex code on the main card, and on the secondary one you can install simpler code if it is used only for the Internet.

When you turn on a phone with two secure cards, the system will ask for the code sequentially, first for the first SIM, then for the second. If you enter the wrong code for one of them, the download process will stop and you will not get access to the network, so it is extremely important to remember the codes for both slots.

Each card is managed through a separate sub-item in the settings menu, and you can turn off the password request for one card at any time, leaving the second card protected, or change the codes independently of each other.

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Tip: Use different PINs for different SIM cards so that if one code is compromised (for example, if it is seen over your shoulder), the second communication line remains secure.

Common Errors and How to Resolve Them

Users often face technical problems or limitations on the part of telecom operators during the setup process, and one common mistake is to say, “PIN failed to change,” which can occur if you enter the wrong current code or if the SIM card is only in data mode (at some rare rates).

Another problem is that the touchscreen is not working properly or the MIUI software is failing when the input field is not accepting the numbers, so try restarting the device and repeating the procedure. If the problem persists, remove the SIM card, wipe the contacts and paste it back in, making sure it sits tightly in the tray.

It is also important to note that some of the older SIM-Cards (especially those issued more than 10 years ago) may have restrictions on the user changing the code, in which case the only solution is to replace the SIM card with a new one in the operator’s cabin, which is usually free of charge while saving the number.

⚠️ Note: If after three incorrect PIN inputs, the phone will request PUK, Don't panic. That's a regular situation. Type in an 8-digit PUK-code, then come up with a new PIN. The key is to make sure you don't go wrong with it. PUK-code.

Unlocking SIM post-lock (PUK-code)

If you have entered the wrong PIN three times, SIM-The card is blocked, and a message will appear on the screen about the need to enter PUK-At this point, the phone doesn't allow you to make calls or use the mobile Internet. To unlock it, you'll need the same 8-digit code we talked about at the beginning of this article.

The unlocking process is as follows: enter on the lock screen PUK-The system will ask you to come up with a new PIN (from 4 to 8 digits), enter it, then repeat it for confirmation. If it went well, the SIM card is unlocked, and you can use the phone normally.

It is important to know where to look. PUK-The code, if the plastic card is lost, is used by most of the major operators (MTS, Beeline, MegaFon, Tele2) You can recognize him:

• 📱 In the personal account on the operator's website or in the mobile application (section "Settings" or "Information about the SIM card»).
• 📞 Calling the support service from another number (the operator will identify the passport data).
• 🏢 Contacting the salon in person with a passport.

After successful unlocking, it is strongly recommended to write the new PIN code to a secure location immediately to avoid a recurrence of the situation.

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PUK-The code is the master key for your SIM-It can't be changed or invented by itself, it's issued by the operator and only serves to reset the PIN.

Frequently Asked Questions (FAQ)