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

The protection of personal data begins with basic security measures, and the setting of a password for the SIM-The card is one of them. On Xiaomi Redmi smartphones, this feature prevents unauthorized use of your number, even if the phone falls into the wrong hands. PIN-The attacker will not be able to make calls, send SMS Or use the mobile internet with your SIM-map.

In this article, we will discuss how to activate the protection. SIM-cards on Redmi devices (including Redmi Note 12, Redmi 10, Redmi 9 and others), what to do if you forget your password, and how to avoid blocking the card. PIN-code PUK-Why you should never keep it in your phone’s notes.

Important: the setup procedure is almost identical for all Xiaomi smartphones on the basis MIUI (including POCO and Black Shark), but there may be minor differences in the location of menu items depending on the firmware version. A3), The instructions will also fit – the difference is only in the design of the interface.

Why do you need protection? SIM-password-card?

Many users neglect the installation PIN-code SIM-But statistics suggest otherwise: according to Kaspersky, more than 30 percent of smartphone thefts are associated with attempted fraud. SIM-card – from calls to paid numbers to interception SMS for resetting passwords of banking applications.

Here are the key reasons to activate the protection:

• 🔒 Blocking Unauthorized Calls: No PIN-The attacker will not be able to call paid numbers or international destinations.
• 📱 Protection against cloning SIM: Some types of fraud (such as SIM-swapping) require physical access to the card. PIN-code complicates the task.
• 💳 Banking security: If your phone is stolen, a scammer will not be able to get hold of it. SMS proof-code.
• 🔄 Data security in case of loss: even if the phone falls into the hands of an outsider, your SIM-the card will remain blocked.

In addition, some operators (for example, MTS or Beeline) automatically block premium mailing services if they are not able to use the service. SIM-card activated PIN-This is an added bonus for those who are tired of intrusive advertising.

⚠️ Note: If you use two of these SIM-Redmi cards (dual slot), you need to set the password on each card separately. PIN-codes can be different – it is convenient if one card is working and the second is personal.

Preparation: What to Know Before Setup

Before you start setting your password, make sure you have:

1. Standard. PIN-code that comes with the same SIM-card (usually indicated on the plastic holder or in documents from the operator).
2. PUK-code (in case you forget your password) can also be found on the holder SIM-card or request from the operator.
3. Access another phone (in case of lockdown) to contact operator support.

If you don't know the standard PIN-code, it's okay:

• 📄 Find it on the package. SIM-cards (usually 4 digits, such as 0000 or 1234).
• 📞 Check with the operator through a call in support (passport required).
• 🌐 View in the personal account on the operator's website (section "My devices" or "SIM-map").

💡

If you bought it. SIM-I don't remember the map for a long time. PIN-code, try standard combinations: 0000, 1111, 1234 or 9999. Operators often set them by default.

Also pay attention to the following nuances:

• 🔄 After activation PIN-It will have to be entered every time you turn on the phone or restart.
• 📵 If you enter the incorrect 3 times in a row PIN, SIM-The card will be blocked and will be required. PUK-unlocker.
• 🔧 Some operators (e.g. Tele2) allow you to disable the request PIN-code USSD-The team, but it reduces security.

Step-by-step: how to put a password on SIM-map

The setup process is the same for most Redmi models, including the Redmi Note 11, Redmi 13C, Redmi A2 Follow the instructions:

1. Open the Settings app (the gear icon on the home screen).
2. Scroll down and select the Passwords and Security section.
3. Tap on Device Security (in some versions) MIUI This section may be called Additional Settings).
4. Select Lockdown. SIM-maps (or settings) SIM-map → Lockdown PIN).
5. Activate the switch Lock SIM-maps (it will turn blue).
6. Enter the current one. PIN-code (standard or the one you previously installed).
7. Press OK or Ready.

If you want to change the standard PIN-code to your own, follow additional steps:

1. After activating the lock, tap on the line Change PIN-code SIM-map.
2. Enter the old PIN (current).
3. Enter a new one. PIN (4-to-8 digits).
4. Confirm the new PIN by re-entering.
5. Press OK.

Is the password correctly entered when restarting?

Is access to the mobile network maintained?

No request. PUK-code (this means blocking the code)

Are the calls working and SMS-->

On some models (e.g. Redmi) 9T Redmi Note 10 Pro: The path to settings may be slightly different:

Settings → SIM- Cards and Mobile Networks → [Select SIM- Card] → Lock SIM- Cards

⚠️ Note: If after activation PIN-If the phone stopped catching the network, check if you entered the code incorrectly 3 times in a row. SIM-The card is blocked and will be required. PUK-Don't try to guess it -- after 10 wrong attempts, the card will be permanently blocked.

What to do if you forget your password SIM-map?

A situation where the user forgets PIN-It's a code that happens a lot. Fortunately, it can be solved if you have one. PUK-Personal Unblocking Key: This is the algorithm:

1. After three incorrect attempts to enter PIN The phone will notify you: "SIM-- The card is locked. PUK-code".
2. Enter. PUK-code (8 digits, indicated on the holder) SIM-cards or in the documents of the operator).
3. The system will propose to introduce a new PIN-code (think it up in advance and write it down in a safe place).
4. Confirm the new PIN by re-entering.
5. Press OK — SIM-card unlocked.

If you don't know PUK-code, it's okay:

• 📄 Find on a plastic holder SIM-maps (near the PIN-code).
• 📞 Check with the operator by phone support (passport required).
• 🏦 Get in the operator’s salon (have a passport and a contract with you).

Some operators allow the restoration of PUK-code through a personal account:

⚠️ Warning: Never keep it. PIN and PUK-If the device is stolen, the attacker will have access to both codes, write them down on paper and store them in a safe place (for example, in a safe deposit box or home documents).

How to disable the request PIN-code on Xiaomi Redmi?

If you decide that the protection SIM-You don't need a card, you can turn it off:

1. Go to Settings. → Passwords and security → Security of the device → Lockdown SIM-map.
2. Turn off the SIM-card lock switch.
3. Enter the current one. PIN-proof-code.
4. Press OK.

Some operators also allow you to disable the request. PIN-code USSD-team:

• 📱 MTS: Dial *111*181# and follow the instructions.
• 📱 Beeline: send SMS textual PIN OFF 5151.
• 📱 MegaFon: Call me *105*00# and select the off option PIN.

Important: offline PIN-The code reduces the security of your SIM-If the phone is stolen, the attacker will be able to freely use your number.

Frequent problems and their solutions

When working with PIN-And the code on Xiaomi Redmi is that users are faced with common errors:

1.The phone is not receiving the correct PIN-code

If you are sure you are entering the correct code but your phone is not accepting it:

• 🔄 Restart the device and try again.
• 📵 Check if the flight mode is on (sometimes it blocks the operation) SIM).
• 🔧 Make sure you choose the right one. SIM-card (if you have two).
• 📱 Try entering the code on another phone – maybe the problem is in the slot SIM-map.

2. After input PIN no net

If, after proper input, PIN-code the network does not appear:

• 🔄 Reboot the phone.
• 📶 Manually select the operator in the settings: Settings → SIM-maps and mobile networks → [Yours. SIM] → Network operators.
• 🔧 Check if the "only" mode is activated. 2G/3G" (Sometimes it interferes with online registration).
• 📱 Remove and re-insert. SIM-card (by pre-switching off the phone).

3. Forgot. PUK-code and the operator does not help

If you lost PUK-code and operator refuses to restore it (for example, due to lack of documents), the only way out is to replace it. SIM-For this, it's a map:

1. Contact the operator's communication salon with a passport.
2. Write a replacement application SIM-number-card.
3. Pay for the cost of a new card (usually 50-200 rubles).
4. Wait for activation (can take anywhere from 10 minutes to 24 hours).

💡

If you often forget passwords, use password managers (like KeePass or Bitwarden), but never store them. PIN and PUK In the cloud or on the phone itself.

Additional security measures for Xiaomi Redmi

Installation PIN-code SIM-The card is just the first step to data protection. To make your Redmi as secure as possible, we recommend that you:

• 🔐 Set a pattern lock or password on the lock screen: Settings → Lock screen → Type of lockdown.
• 📱 Activate the "Find Device" function: Settings → Google → Security → Find my device.
• 🔑 Enable phone encryption (for sensitive data): Settings → Additionally. → Confidentiality → Encryption.
• 🛡️ Set up two-factor authentication for important accounts (Google, banks, social networks).
• 📵 Disable notifications on the lock screen: Settings → Notifications → On the lock screen.

For models with MIUI 14 and later, the "Private Mode" feature is available, which allows you to hide selected applications and files from prying eyes. → Privacy.

It is also useful to set up an automatic lock. SIM-Removal cards (if your Redmi supports this feature:

1. Go to Settings. → SIM-maps and mobile networks.
2. Choose yours. SIM-map.
3. Activate the "Block When Removed" option (if any).

FAQ: Answers to Frequent Questions