In today's digital world, privacy is coming to the forefront, and the first line of defense is often the mobile phone. PIN-SIM card code is a basic but critical step that many users ignore, relying only on locking the screen of the smartphone. SIM-The card will allow you to move it to another phone and access bank SMS confirmations and accounts.
Owners of Xiaomi, Redmi and Poco devices may face the fact that the interface MIUI HyperOS has its own navigation features, different from pure Android. In this article, we will discuss in detail the process of activating protection, explain the difference between the two. PIN and PUK We'll give you some codes and some advice on how to avoid locking your SIM card forever. PIN-The SIM card is blocked and you will need to unlock it. PUK-code that is on the plastic card holder.
The setup process takes only a few minutes, but provides a level of security comparable to banking, and we'll look at not only standard methods through system settings, but also answer questions that arise when you change operator or lose source data. Let's figure out how to turn your smartphone into an impregnable fortress for your personal information.
Why protection is needed SIM-maps on Xiaomi
Many users mistakenly believe that the password on the lock screen is enough for complete security. SIM-The card works at a lower level and works even when the phone is turned off or locked, so if an attacker pulls your SIM and inserts it into his device, he can receive calls and, most dangerously, confirmation codes to log into online banking or instant messengers.
Xiaomi devices store huge amounts of personal information tied to a phone number. PIN-Even if the phone is stolen when it's off, without the SIM password, it's useless in another device, and that gives you precious time to lock the SIM card through a carrier.
In addition, activating this feature prevents accidental use of your number in paid subscriptions if children use the phone. SIM lock requires entering a code every time you reboot the device, which guarantees access control. Owners of Redmi Note and Xiaomi Mi series often use the phone for work where leaking corporate data through SMS gateways is unacceptable.
⚠️ Warning: Don't set too simple combinations like 0000, 1111 or 1234. Attackers often try them first. Use unique numbers that are easy to remember but hard to guess.
Preparation for password installation: standard codes and PUK
Before you get into menu settings, it's important to understand what codes you're going to encounter. PIN-For most Russian operators, such as MTS, Beeline, MegaFon or Tele2, The standard code is often 0000 or 1111, but you shouldn't rely on it, because the settings may have been changed before.
A critically important element is PUK-Personal Unblocking Key is a long combination of numbers that is used only to unlock the SIM card after three failed attempts to enter. PIN-You can find it on a plastic card that came with a SIM card when you bought it, and if you threw away the plastic, you can find it in the operator's personal account or get it from the phone when you show your passport.
For owners of Xiaomi devices with two SIM cards, the process is identical, but you will need to adjust the protection separately for each of them. MIUI clearly SIM-map 1 and SIM-Card 2, allowing you to set different passwords, which increases security, because compromise of one code will not affect the second number.
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Save it. PUK-code in a secure location, such as a password manager, or write it in a notebook that's stored separately from your phone. PUK-It is impossible to restore access to the blocked SIM card, and you will have to order a duplicate from the operator.
Step-by-step instruction: installation PIN-code through settings
The interface of the MIUI shell and the new HyperOS may be slightly different visually, but the logic of action remains the same for all models, whether it is a budget Redmi or flagship Xiaomi 14.
☑️ Checklist of the protection installation
First, open the main menu and find the Settings icon. At the top of the screen, you'll usually find a Settings search, which is the fastest way to find the item you want. Type a Block request into the search box. SIM or SIM-If you prefer manual navigation, go to Application Protection or Passwords and Security and then select Privacy or Security. SIM-map.
In the menu that opens, you'll see a list of SIM cards installed. Click on the one you want to protect. Slide the lock. SIM-The system will request the current entry. PIN-If you're installing protection for the first time and the standard code doesn't work, try 0000 or 1111. PIN-code and confirm it by re-entering.
After performing these actions, every time you restart the phone or remove the SIM card, a request for input will appear. PIN-For Poco and Xiaomi dual-SIM devices, repeat the procedure for the second slot if necessary. Remember that the code entry is required to access the operator's network, not to unlock the smartphone screen.
| Action. | Where to find in MIUI/HyperOS | Data required |
|---|---|---|
| Entrance to the menu | Settings → Passwords and Security → Privacy | No. |
| Choosing a SIM | Lockdown SIM-map → SIM 1 / SIM 2 | No. |
| Activation. | Switch "Blocking SIM-card" | Current PIN (default 0000) |
| Change of code | Change. PIN-code SIM-map | Old and new PIN |
How to change or disable a request PIN-code
There are different situations: you may have forgotten the complex code you installed earlier, or you may have simply decided to abandon this security measure. PIN-code on Xiaomi, go back to the same menu SIM-There's an option to change. PIN-code SIM-map.
The system will ask you to enter the current code, then you will be asked to enter the new code twice for confirmation, and it is recommended to use combinations that are not obvious (avoid birth dates). If you want to completely disable the password request, just transfer the lock switch SIM-You'll need to enter the current card again. PIN-code.
What to do if the phone asks for PUK-code immediately after inclusion?
It is important to note that in some operators and in some regions, the shutdown PIN-The code may be temporarily unavailable through the phone's menu, in which case the system will issue a message that the operation cannot be performed.
⚠️ Note: If you have changed PIN-If you forget the code, don't try to guess the code by brute force. PUK-Ten input errors. PUK-The code will result in a physical lock of the SIM card chip.
Problems with code entry and blocking SIM-map
The most common problem faced by Redmi and Xiaomi users is blocking the SIM card after unsuccessful attempts to enter. PIN, PUK-This is a security mechanism that prevents brute-force passwords from being matched by a method of brute-force.
If you see a message about the need to enter PUK, You can do it quickly and carefully, and you can type in the 8-digit code that you've provided, and then you can get the system to ask you to come up with a new one. PIN-The code is validated, and then the network is restored, and you can enter the code carefully, without haste, because the counter can no longer be reset.
In rare cases, Xiaomi smartphones may experience a software failure when a request is made. PIN-In these cases, it helps to restart the device without a SIM card, install it after the system is fully loaded, or reset the network settings. → Connection and sharing → Reset Wi-Fi, mobile networks and Bluetooth.
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Locking your SIM card through a PUK is an extreme measure of protection. If you are not sure about the code, you should contact the operator's salon so that you do not lock the chip permanently.
Features of working with two SIM-cards on MIUI
Xiaomi smartphones are famous for supporting two physical SIM cards, which is very popular in Russia and the CIS. Password management for them is divided. PIN-The code is only on the main SIM card, leaving the second one open, or protecting both. When you turn on the phone, the system will consistently request the codes for each active SIM.
In the interface. MIUI The settings may be called the management SIM-It is convenient to switch between slots. Note that when you change slots (if you physically move the SIMs in places), the password settings are stored behind a particular slot or behind a SIM card profile, depending on the firmware version. Be careful when entering, so as not to accidentally block the working number.
For corporate users or those who share personal and work spaces, it is recommended to use different types of workspaces. PIN-This minimizes the risk, and if one number is compromised or blocked, the other number will remain available for communication. Owners of Redmi Note 13 and later models can also use the virtual SIM (eSIM) function, where pin-code installation occurs in a similar way through the operator profile.