How to put a PIN on SIM-Xiaomi card: protection against unauthorized access

Personal data protection begins with basic security measures, and one of them is the installation of a PIN code on the security system. SIM-Many Xiaomi users, including Redmi Note 12 models, POCO X5 Mi 11, or Mi, neglect this function, thinking it's unnecessary, but without a PIN, the attacker who stole your phone can easily retrieve it. SIM-map, insert it into another machine and access it SMS (Moreover, some operators default to disable the PIN request on the first connection, leaving the user without protection.

In this article, we will discuss how to enable a PIN request on Xiaomi through standard settings, what to do if you forget the code, and why sometimes the function may not work. Also, you will learn about the hidden nuances: for example, on some MIUI firmwares, the PIN request is reset after a system update, a bug that is only fixed by reconfiguring. If you have never installed the PIN or want to recheck the current settings, read on.

It’s worth noting that the procedure is the same for most Xiaomi models, but may be slightly different on custom firmware devices (like Xiaomi.EU or Pixel Experience).If your smartphone runs pure Android (like POCO F5 on global firmware), the interface will be closer to standard Google, but the essence will remain the same.

Why put a PIN on a SIM-map?

Many users believe that the lock screen (print, pattern lock or password) is quite reliable protect the phone. SIM-The map solves other tasks:

🔹 Protection against theft SIM: Without a PIN, a thief can extract your card and use it on another phone, and with a PIN, he will need to enter the code every time he turns on the device or restarts it.

🔹 Blocking access to SMS: Even if the phone is unlocked, without a PIN code SIM-The card will not work, which means that the attacker will not be able to get SMS confirmation-coded.

🔹 Compliance with corporate rules: Some companies require employees to include PINs on their SIM protect corporate data.

In addition, the PIN code protects against accidental use. SIM-For example, if you sell or transfer your phone to another person, but you forget to remove the card, the new owner will not be able to use it.

⚠️ Note: If you install a PIN, but forget it, unlock it. SIM-The map will be available only with the help of PUK-After 3 false attempts to enter the PIN, the card is permanently blocked!

How to put a PIN on SIM-map: step-by-step instruction

The process of activating the PIN code on Xiaomi takes no more than a minute.

1. The smartphone itself with the installed SIM-card.
2. Know the current PIN (if it has already been installed)
3. Network connection (optional, to check the SIM after setting up).

Now, let's get to the settings. Open the Settings app and follow the instructions.

Go to Settings → SIM-cards and mobile networks

Pick the right one. SIM-card (if there are several)

Click on “Blocking” SIM-map»

Turn on the "Request PIN" switch

Enter the current PIN (by default, often 0000 or 1234)

Save changes and restart your phone-->

If you have two. SIM-If you reboot the card, repeat the procedure for each individual, the system will request a PIN after the restart, which means that the setup was successful.

💡 Important: On some firmware MIUI (especially Chinese version) Blocking SIM-cards may be called SIM-map → Additional settings → If you do not find the desired section, search in the settings (the icon of the magnifier at the top).

What to do if I forget my PIN code?

A forgotten PIN is one of the most common problems, and fortunately, it can be solved, but it will require a solution. PUK-Personal Unblocking Key: This code is issued with SIM-card when buying (usually indicated on the plastic holder) or it can be recognized from the operator.

If you entered the PIN incorrectly 3 times in a row, SIM-The card is blocked and a request will appear on the screen. PUK. Enter it, then set a new PIN. Attention: if you make a mistake 10 times PUK, SIM-The card will be irrevocably blocked, and you will have to order a duplicate from the operator.

📌 Where to find it. PUK, if you lose the packaging of SIM?

• 📞 Call the operator (the support number is usually listed on the website).
• 🌐 Go to the personal account on the operator's website (section "Management" SIM-card»).
• 🏦 Contact the Salon of Communication with a Passport.

If you have never changed a PIN, try the standard combinations:

• 🔢 0000 or 1234 – the most common factory PIN codes.
• 🔢 The last 4 digits of the phone number (sometimes operators set such a PIN).
• 🔢 Date of birth (if you have previously installed the code).

Xiaomi PIN Problems: Why Doesn’t It Work?

Sometimes users find that the PIN code is not requested despite the settings enabled.

If none of the solutions worked, try the following steps:

1. Delete. SIM-map and paste it back (sometimes resetting recognition helps).
2. Check if the phone has an SIM management app (like Dual Apps or Second Space) that can block settings.
3. Reset network settings: Settings → SIM-maps and mobile networks → Resetting mobile network settings.

Yes, I had to restore it through PUK|No, I always remember PIN | I don't put a PIN, so I don't forget | I don't know what PUK-->

How to change or disable a PIN on SIM in Xiaomi

If you want to change the PIN to a more reliable one or temporarily disable its request, do the following:

🔹 Change of PIN code:

1. Go to Settings. → SIM-maps and mobile networks.
2. Choose the right one. SIM-map → Lockdown SIM-map.
3. Press Change PIN.
4. Enter the old PIN, then the new one (2 times for confirmation).

🔹 Disabling the PIN request:

Just switch the Ask PIN switch to Off, but remember, it will reduce your security. SIM-map.

💡 Tip: If you temporarily disable the PIN (for example, to test another one) SIM), Remember to turn it back on. Many users forget about it, leaving the map unprotected.

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Use password managers (such as Google Password Manager or KeePass) to store a PIN and PUK-codes in a safe place. Never write them down on paper next to your phone!

Additional security measures for SIM-map

PIN is just the first step, to protect your security as much as possible. SIM-map, we recommend:

• 🔒 Set a password on the operator's personal account, this will prevent changing the tariff or ordering paid services without your knowledge.
• 📱 Activate the service "Porting number ban" This will protect against scammers who may try to transfer your number to another. SIM (Social engineering).
• 🛡️ Use two-factor authentication (2FA) for important services, even if the attacker gains access to SMS, It will require a second factor (e.g. code from the Google Authenticator app).
• 🔄 Check active services regularly. USSD-request *111# (for MTS), *100# (for Beeline) or *105# (for MegaFon) to see the connected options.

Also worth knowing about is a new threat, SIM-swapping, which tricks the operator into giving you a duplicate of your SIM, and then accesses your accounts to avoid:

• Do not post photos of documents on social networks or SIM-map.
• Do not answer calls from the bank asking you to name codes from SMS.
• Check with the operator whether you can set an additional password for changes to your number.

Frequent questions about the PIN code on Xiaomi

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PIN SIM-A card is a minimal but critical security measure that does not protect against phone hacking, but prevents unauthorized use of your number, which is especially important for protecting bank accounts and social networks.