How to install PIN-code SIM-Xiaomi Redmi Note 7: protection against theft and hacking

Xiaomi Redmi Note 7 remains a popular smartphone even years after the release – thanks to reliable “iron” and flexible firmware MIUI. But many users are missing out on basic protection: PIN-code SIM-Without it, an attacker can move your SIM to another phone in 10 minutes, gain access to the phone. SMS (This guide will help you to set up security correctly, taking into account the features of the Redmi Note 7 and possible errors.

Unlike a pattern lock or fingerprint, PIN SIM-It's not the phone itself that protects the cards, it's the communication module itself, which means that even if the phone is stolen or hacked, it's not the phone itself. PIN-We will not only examine the standard way of settings, but also alternative methods (for example, if the menu is blocked). MIUI It is different from yours, and why you should never use a default code like 0000 or 1234, which can be broken in seconds with specialized scanners.

Why should I set up PIN-code SIM-map in 2026?

According to Kaspersky Lab, in 2023 the number of attacks through substitution SIM-The cards are up 40 percent from the previous year, and scammers are using operator vulnerabilities, social engineering, or even database hacking to duplicate your SIM and gain control of your accounts. PIN-Code is the first and most reliable barrier to their path.

That's what activation does. PIN-code on the Redmi Note 7:

• 🔒 Locking the SIM card when you steal your phone, without the code, you can't use it on another device.
• 💳 Bank protection SMS. Even if the attacker takes out the SIM, he will not be able to confirm the transfers.
• 📱 Many fraud schemes require physical access to the SIM — PIN eliminates.
• 🚨 A suspicious activity alert, if the SIM locks itself, is a signal of a possible attack.

But there are downsides to this: you have to enter the code every time you reboot your phone or turn on In-Air mode, but that's a small security charge -- especially since you can set up an automatic Wi-Fi connection for calls on the Redmi Note 7 to make fewer reboots.

Preparation: What to Know Before Installation PIN-code

Before you activate the protection, check a few key points:

1. Make sure that SIM-The card is not blocked by the operator, unless you have used a SIM for a long time or entered it. PIN It could have been blocked incorrectly, in which case it would have to be PUK-code (it can be found from the operator or in the personal account).
2. Remember or write down the standard PIN. Usually it's 0000, 1111, or 1234, but some operators (like Tele2) may have other combinations.
3. Check the version. MIUI. Redmi Note 7 can be installed firmware from MIUI 10. MIUI 14.In older versions, the path to settings SIM differ.

⚠️ Note: If you enter the wrong 3 times in a row PIN, SIM-The card will be blocked and will require PUK-It's only available from the operator -- it's not stored in the phone. PIN brute-force.

Also note that the Redmi Note 7 has two SIMs (Dual) SIM) PIN You have to customize it for each one, and if one of the SIMs is only used for the Internet (no calls), you can leave it unprotected, but that would reduce the overall level of security.

Step-by-step instructions: how to install PIN-code SIM Redmi Note 7

So, to the main thing, the protection settings, the instructions are suitable for all versions. MIUI, But if you have custom firmware (like Pixel Experience), the path may be different.

Make sure the SIMKA is active and catches the net

Write down the standard PIN (in case of error)

Check the battery charge (at least 20%)

Connect to Wi-Fi (if you need to download updates)-->

Steps to set up:

1. Open “Settings” (the gear icon on the desktop or in the application menu).
2. Go to section «SIM-Maps and mobile networks (in some versions) MIUI It's called "Two." SIM-maps and mobile network»).
3. Choose the SIM for which you want to install PIN (If there are two, click on the right one at the top of the screen).
4. Slip on "Blocking" SIM-cards" (or "Request PIN-code»).
5. Activate the switch in the top corner of the screen. The system will ask you to enter the current one. PIN (By default, "0000" or "1234»).
6. Enter a new one. PIN-code (from 4 to 8 digits) and confirm it. Avoid simple combinations such as date of birth or repeating digits.

Once saved, the phone will restart (or ask to restart) and will now be asked for every time you turn on or leave In-Air mode. PIN.

⚠️ Attention: If after installation PIN The phone stopped catching the network, check if the mode is activated. 2G». Some operators (such as MTS) are blocking 3G/4G If you have incorrect security settings, you can fix this in Settings. → SIM-map → Preferred type of network (select the network «4G/3G/2G»).

Alternative methods of installation PIN (if the standard doesn't work)

Sometimes menus MIUI It may be different due to updates or custom firmware. If you did not find the "Block" section SIM-Maps, try these methods:

Method 1: Engineering menu (for experienced users)

This method works on all versions of the Redmi Note 7, but it requires caution:

1. Open the Phone app and enter the combination: ##4636###.
2. In the menu that opens, select “Phone Information”.
3. Scroll down to the section. SIM Status and tap on the right SIM.
4. Find the Lock Status line and click "Enable." Type a new one. PIN.

Method 2: Through USSD-operator

Some operators (for example, Beeline or MegaFon) allow you to manage PIN through USSD. Try sending one of the teams:

• 📞 *111*123# — for MTS (security services management).
• 📞 *105# - for Beeline (section "My SIMKA»).
• 📞 *558# — body2 (setting PIN/PUK).

⚠️ Attention: USSD-If the commands don't work, check the official website of the operator. Don't use commands from unknown sources, they can activate paid services!

Method 3: Resetting network settings

If you're on the menu SIM-Cards are missing after the update, try resetting your network settings:

1. Go to Settings → System → Resetting settings.
2. Select “Reset Network Settings” (not to be confused with a full reset!).
3. After restarting, check for the “Blocking” section. SIM-map».

💡

If you travel frequently, you should PIN Both SIMs will protect against theft of numbers abroad, and in roaming, fraudsters often exploit vulnerabilities of local operators to duplicate their numbers. SIM.

How to change or disable PIN-code for Redmi Note 7

If you want to change PIN Or temporarily disable it (for example, to test another SIM), do the following:

Change of PIN- code

1. Go to Settings. → SIM-maps and mobile networks.
2. Select the SIM and tap "Blocking" SIM-map».
3. Enter the current one. PIN, Then, a new one (twice to confirm).

Shutdown PIN-code

To deactivate the protection:

1. Follow the same path: Settings → SIM-map → Lockdown SIM-map.
2. Turn off the switch and enter the current one. PIN confirm.

⚠️ Attention: After disconnection PIN If you temporarily turn off the protection (for example, for repairing your phone), remember to turn it back on! Fraudsters often steal the data of the SIMs in service centers.

Frequent mistakes and their solutions

When you set up PIN On Redmi Note 7, users are facing typical problems:

1. The section “Blocking” is not located SIM-map»

Reason: An outdated version MIUI custom-made.

Decision:

• 🔄 Update the firmware through Settings → The phone. → Updating the system.
• 🔍 Use the search by settings (the magnifying glass icon at the top of the screen), enter «PIN».
• 📱 Install official software via Mi Flash Tool (instructions on the Xiaomi website).

2.The phone asks PUK-code after 3 wrong attempts

Reason: Exceeded number of attempts to enter PIN.

Decision:

• 📄 Find it. PUK in documents to the SIM card or in the operator’s personal account.
• 📞 Call support (numbers: MTS - 0890, Beeline - 0611, MegaFon - 0500).
• 🚫 Don't enter. PUK After 10 errors, the SIM will be blocked forever!

3.After installation PIN mobile network gone

Reason: Network settings conflict or operator error.

Decision:

• 🔄 Reboot the phone.
• 📶 Manually select the operator in Settings → SIM-map → Choice of network.
• 📱 Reset your network settings (see section above).

💡

After installation PIN The phone stopped seeing the SIM, check if the mode is activated. 2G». Some operators automatically switch the network when changing security settings.

Additional security measures for Xiaomi Redmi Note 7

PIN-code SIM-To fully protect your Redmi Note 7, we recommend that you take the first step:

• 🔐 Set a graphical key or password on the lock screen, which will protect the data on the phone even if the SIM is removed.
• 👆 Activate unlocking by fingerprint (in Settings) → Lock screen → Fingerprint).
• 🔗 Turn off the automatic connection to open Wi-Fi (this will reduce the risk) MITM-attack).
• 📱 Set up a remote lock via Mi Account, and if your phone gets stolen, you can block it through i.mi.com.
• 🔄 Update your firmware regularly. MIUI Vulnerabilities related to SIM-map.

You should also install an application from the operator (for example, My MTS or MegaFon-Service).

• 📊 Monitoring SIM activity (incoming/outgoing calls).
• 🔒 Instantly block the SIM when lost.
• 💳 Manage paid subscriptions (fraudsters often connect them through a subscription service) USSD).

⚠️ Warning: Never keep it. PIN and PUK-If an attacker gains access to an account, they can unlock the SIM, write the codes down on paper and store them in a safe place.

FAQ: Answers to Frequent Questions