The modern smartphone has become the digital storehouse of our lives, and losing access to it or stealing a device can lead to serious problems. SIM-A card that not only provides connectivity, but also confirms your identity in banking apps and instant messengers. Owners of popular Xiaomi Redmi devices often wonder how to activate this level of protection so that no one else can use your number.
Installation PIN-SIM code is not just an option, it's a necessary step to ensure the security of your account, and if an attacker inserts your SIM into his phone, he will not be able to access the network or read SMS confirmation codes without knowing this code. In this article, we will discuss in detail the process of activating protection, how to restore access in case of data loss and answer important security questions. MIUI HyperOS.
Why do you need protection? SIM-maps in Xiaomi smartphones
Many users neglect to set a password on the SIM card, believing that locking the screen of the smartphone with a fingerprint or pattern lock is enough. However, this is a misconception, since when you reboot the device or extract the card to another phone, the Xiaomi screen lock ceases to act on the SIM itself. PIN-The code is stored directly in the chip card of the operator and is requested by the system regardless of the state of the smartphone itself.
The main purpose of setting a password is to protect against unauthorized use of your number, so if the phone is stolen, the thief can extract the SIM card and insert it into his device to intercept SMS messages from banks or social networks. PIN-The SIM code will remain a useless piece of plastic, which will give you precious time to lock the number through the operator and remotely clean the data.
In addition, SIM card protection prevents accidental costs: Children or inexperienced users can accidentally activate paid subscriptions or make an international call if the device is not operator-level protected.
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PIN-The code is requested by the system immediately after the phone is turned on, before the desktop is unlocked, making it the first and critical security barrier.
Preparation for password installation: standard codes and PUK
Before you go to the Xiaomi Redmi settings, it is important to understand the difference between the two. PIN and PUK codes, as confusion between them can lead to a complete lock of the SIM card. PIN-Personal Identification Number is the password you enter to unlock the SIM when you turn on your phone. By default, carriers set standard combinations that can often be found on a plastic card holder issued when you purchase a SIM.
The most common factory passwords for different operators may vary, but there are universal combinations that are worth trying if you have never changed the settings. Usually these are simple sequences of numbers, such as 0000, 1111 or 1234. If none of the standard codes are suitable, you should contact the operator's salon or personal account on the site, as they can provide the current code by default.
Particular attention should be paid PUK-Personal Unblocking Key is the master key needed to unlock a SIM card after three times incorrectly entering it. PIN-code. PUK It consists of 8 digits and is also indicated on a plastic basis of a SIM card or is available in the subscriber's personal account. PUK-code after blocking the SIM often leads to the need to replace the card operator.
Where to find out. PUK-code if the plastic is lost?
Step-by-step instructions: how to put a password on the SIM
The process of activating the protection of the SIM card on Xiaomi Redmi devices with MIUI or HyperOS shells is quite simple and does not require special skills. All settings are made through the standard system settings menu, where all security tools are collected. Before starting the procedure, make sure that the SIM card is installed in the smartphone and is determined by the system correctly.
To start, you need to open the main settings menu. Find and click on the gear icon to enter the Settings section. Next, scroll down to the Passwords and Security item (in some versions of the firmware it may be called simply Security or inside the Additional section).
☑️ Installation algorithm PIN-code
In the menu you will be interested in the item Privacy SIM-maps or settings SIM-Click on it and you'll see a list of SIM cards installed on your phone (if there are two of them). Select the one you want to password. Switch to the slider Request. PIN-The system will ask you to enter the current PIN-code (standard or previously valid).
Once you successfully enter the old code, you'll have a window to create a new password. Come up with a 4-8 digit combination that's easy to remember but hard to guess. Type it twice to confirm, and from now on, every time you reboot your phone or retrieve your SIM card, the system will require that combination to be entered.
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Write down a new one. PIN-code in a safe place or save it in the password manager immediately after installation, so as not to forget it in the event of a long absence of phone reboots.
How to change or disable a password request
There are different situations: you may have forgotten the complex password you invented earlier, or you may have lost the need for protection and want to remove the extra action when you turn on your phone, and in any case, the password request function is managed in the same menu where it was installed. To change the code, log in to the Passwords and Security section. → Confidentiality SIM-map.
If the request function PIN-code is active, next to the power slider is usually available option Change PIN-When you click on it, the system will ask you to enter your current password, and after you have successfully logged in, you will be asked to enter a new code and confirm it, and it is recommended that you change your passwords periodically, especially if you suspect that someone may have seen you enter them.
To completely disable the password request, it is enough to simply translate the slider Request PIN-The system will require you to enter the current state. PIN-The code to confirm the operation, and then you don't ask for your password when you turn on the phone, but remember, this reduces the security of your data.
What to do if the SIM card is blocked
The most common problem users face after installing protection is locking the SIM card after three times incorrectly entering. PIN-On the screen of the Xiaomi smartphone in this case, a message will appear that the SIM card is blocked, and you will need to enter PUK-It's a security mechanism that prevents password selection by brute-force.
To unlock, you need to enter an 8-digit PUK-Be very careful if you type ten times incorrectly. PUK-code, the SIM card will be locked forever, and you can only restore it by re-releasing a new one from the operator. PUK, Then the system will ask you to come up with a new one. PIN-code and confirm.
If you don't remember PUK-Find the plastic card that originally printed it on, or log into the subscriber's account on your operator's website. The SIM management section always shows the current data. PUK-You can also find it by calling the operator's support from another number.
| Parameter | PIN-code | PUK-code | Where to find out. |
|---|---|---|---|
| Appointment | Daily unlocking of the SIMKA | Unlocking after PIN errors | Plastic SIM card, Personal account |
| Length | 4-8 digits | 8 digits | Indicated on the operator's map |
| Attempts to enter | 3 attempts at | 10 attempts at trying | After exhaustion - blocking |
| Action in case of error | Request. PUK-code | Full SIMKI lockdown | Replacement of SIM card required |
Features of working with two SIM-maps on the Redmi
Xiaomi Redmi smartphones traditionally support two SIM cards at the same time, allowing users to separate personal and work contacts or use tariffs from different operators. It is important to understand that security settings apply to each SIM card separately.
On the privacy menu SIM-The map will show you two separate switches: SIM 1 and SIM 2 You can set up different PIN-If you turn on the phone, the system will consistently request unlocking for each active SIM card if they have a password.
If you use two SIM cards, it is recommended to keep a record of the codes for each of them, so as not to get confused. Write down which code refers to which operator. This is especially true if the SIM cards are issued by different carriers, which may have different standard factory passwords.
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Settings PIN-code stored in the memory of the SIM card, so when you move the SIM to another phone password and his request will be saved.
⚠️ Warning: Never keep it. PIN and PUK If the phone is stolen unlocked, the attacker will immediately gain access to the SIM unlock codes.
⚠️ Attention: When entering PUK-You need to be careful about this code. You have a single digit error when you try to type. PUK It reduces the counter of the remaining attempts, and after 10 errors, the SIM card turns into a useless chip.