How to open SIM-map to Xiaomi: full instructions with photos and videos

You just put a new one in. SIM-Xiaomi card, but the phone insists on entering PUK-code «SIM-Or maybe the smartphone doesn't see the SIM at all after the update. MIUI? This problem is familiar to many owners of Redmi devices, POCO And Mi, especially after flashing, resetting, or buying a used phone, and 80 percent of the time, the SIM lock is not due to hardware failure, but to software settings or operator errors.

In this article, we will discuss all possible reasons for blocking. SIM Xiaomi – from the banal input of the wrong PIN before the communication module malfunctions, you'll learn how to unlock the SIM through the phone menu, using the USSD-What to do if the phone asks for PUK-The code (and where to get it) is a unique problem of devices on the Internet. MIUI 14+, lock-in SIM This may be due to a conflict with the double function. SIM-All instructions tested on current models 2023-2026: Redmi Note 12 Pro+, POCO F5, Xiaomi 13T others.

Why Xiaomi is blocking the SIM-Map: 7 main reasons

Before you try to unlock the SIM, it is important to understand what exactly caused the problem. On Xiaomi devices, the lock can occur due to both user fault and system failures.

• 🔐 Three times incorrectly entered PIN-code - after that the SIM is blocked and requires PUK.
• 📱 Resetting to factory settings – sometimes results in resetting network settings, including settings SIM.
• 🔄 Update MIUI — New firmware versions may conflict with the operator's old settings.
• 🛠️ Incorrect firmware – if you installed custom software (for example, LineageOS), the communication module may not work correctly.
• 📶 Problems with the operator - temporary network failures or blocking the card for non-payment.
• 🔧 Hardware failure - damage to the slot SIM or antenna module (more often after falls or moisture infestation).
• 🔒 The “Double” function SIM-manager - in MIUI 14+ Can automatically disable the second SIM in a profile conflict.

If your Xiaomi is writing «SIM-The card is locked, insert SIM» or "No network," first check if your situation is relevant to one of these cases. PUK, The problem is clearly related to PIN-And if the SIM is not defined at all, it may be the slot or the firmware.

Method 1: Unlocking SIM via PUK-code

The most common situation is that the phone requires PUK-code after several failed attempts to enter PIN. This code is tied to yours. SIM-It's a map and it's issued by the operator. Here's how to find it and enter it:

1. A message will appear on the lock screen «SIM-- The card is locked. PUK».
2. Enter the 8-digit PUK-code (usually indicated on the plastic SIM holder or in a contract with the operator).
3. After successful entry, the system will ask to come up with a new one. PIN-code (you can leave the field empty if you do not want to use the lock).
4. Reboot your phone, the SIM should work.

⚠️ Note: If you make a mistake 10 times PUK, SIM-The card will be permanently locked and you'll have to change it from the operator!

Method 2: Reset network settings (if SIM is not determined)

If the phone doesn't see the SIM at all (writes "No SIM" or "Put SIM in"), the problem may be that the mobile network settings fail, and resetting the network settings will help. Importantly, after this procedure, you have to re-enter the Wi-Fi passwords!

Turn off the mobile internet (to avoid interruption)

Remember or take pictures of Wi-Fi passwords

Make sure the battery is at least 30% charged.

Take it out and put it back in. SIM-Card (check if the slot is not contaminated)-->

Instructions for MIUI 12-14:

1. Go to Settings. → SIM-maps and mobile networks.
2. Select Network Reset (or Additional → Network Reset).
3. Confirm the action and wait for the reboot.
4. After switching on, check if the SIM is defined.

⚠️ Warning: If the SIM still doesn't work after resetting, try manually selecting the operator in the settings:

1. Go to Settings. → SIM-maps and mobile networks → [Yours. SIM] → Network operators.
2. Turn off Automatic Selection and select your operator manually.
3. Wait for registration online (can take up to 5 minutes).

Method 3: Unlocking through the Engineering Menu (for experienced)

If standard methods don’t work, you can try unlocking the SIM through an engineering menu (a hidden Xiaomi service menu), which is suitable for Qualcomm Snapdragon devices (most Redmi and POCO models).

Instructions:

1. Open the Phone app and enter the combination: ##4636##.
2. In the menu that opens, select Phone Information.
3. Scroll down to the Set preferred network type block and select LTE only (or GSM only if LTE doesn't work).
4. Go back and select Update PRL profile (if any).
5. Reboot the phone.

🔹 Note: Some firmware may have the engineering menu blocked, in which case try to enter the combination ##36446337## (to check for information about the app). SIM).

💡

If the engineering menu doesn’t open, try entering the code through the MTK Engineering Mode app (available in the Play Market for devices on MediaTek).

Method 4: Update the firmware (if the lock after the update)

Sometimes. SIM-The card stops working after the update MIUI. This is because the new firmware version may reset the communication module settings or conflict with the operator's drivers, and the solution is to upgrade to the latest stable version or roll back.

How to update MIUI:

1. Go to Settings → About the phone → System update.
2. Click Check Updates and install the latest version (if available).
3. If the update doesn’t help, try installing firmware manually through Settings → Additional → Update via file.

🔹 For power users: If the lock occurred after the update, you can try to roll back to the previous version MIUI It's on Fastboot:

1. Download the desired firmware version from the Xiaomi Firmware Updater website.
2. Unpack the archive and use the Mi Flash Tool to run your phone in Fastboot mode.
3. After the firmware, reset the settings.

💡

If the lockdown SIM appeared after the update before MIUI 14+, Try to disable the “Double” function. SIM-manager" in settings SIM-It may conflict with some operators.

Method 5: Hardware inspection (if nothing helps)

If all software methods are exhausted and the SIM still doesn’t work, the problem may be in the hardware:

• 🔌 The slot is damaged. SIM — Check if the contacts are bent (take care to put them with a needle if they are drowned).
• 📡 The antenna is faulty – if the phone does not catch the network even with another SIM, the antenna plume may have departed.
• 🔋 Problems with the communication module - after falls or moisture can fail the chip responsible for mobile communication.

🔧 How to check:

1. Insert the SIM into another phone – if it works, the problem is your Xiaomi.
2. Try another SIM on your phone – if it’s not determined, too, the slot or module is to blame.
3. Check if the contacts on the board are burning (a sign of moisture getting in).

⚠️ Warning: If you are unsure of your repair skills, don't disassemble the phone yourself - this could lead to a loss of warranty. contact Xiaomi's service center or workshop with good reviews.

Frequent Mistakes and How to Avoid Them

Many users make the problem of blocking SIM worse by making common mistakes, and this is what you can’t do if your Xiaomi doesn’t see the SIM:

• 🚫 Enter PUK At random – after 10 wrong attempts, the SIM will be blocked forever.
• 🚫 Use unofficial firmware – they can conflict with the drivers of the communication module.
• 🚫 Clean the slot SIM alcohol solution - this can damage the contacts (it is better to use a dry brush).
• 🚫 Reset your phone to factory settings without backup – you’ll lose all data and the problem may remain.

🔹 A useful tip: If you change often SIM-maps (for example, on trips), disable the request PIN-Code in settings: Settings → SIM-maps and mobile networks → [Yours. SIM] → Request. PIN-This will save you the risk of accidental locking.

FAQ: Answers to Frequent Questions