SIM-Not installed or activated on Xiaomi: reasons and solutions

You put it in. SIM-Xiaomi map, but the phone is persistently writing «SIM-The problem is familiar to many owners of smartphones of this brand - from the budget Redmi Note to the flagship Xiaomi 14. most often the error occurs after updating the firmware, replacing the SIM or mechanical impact on the device. But in 90% of cases, it can be eliminated independently without contacting the service center.

In this article, we will look at all possible causes, from common contact contamination to hardware malfunctions in the communication module, and learn how to check the tray, reset network settings, update firmware, and even diagnose a malfunction using an engineering menu. If the problem lies in the operator, we will tell you how to activate it quickly. SIM-map USSD-Teams or applications "My MTS / Telephone"2/MegaFon/Beeline».

Important: some methods require a smartphone reboot or a temporary shutdown of the mobile network. If you use a two-sim Xiaomi, check both cards separately - the problem can affect only one slot. SIM-card (if any) to prevent its malfunction.

1. Checking the physical condition SIM-card-tray

Start with the most obvious: Remove SIM-And look at the map and see if it's damaged. The chips on today's nano-SIM are fragile -- even a small scratch or chip can cause you to lose contact, especially if you've cropped the card yourself or used a micro-SIM adapter.

Also check:

• 🔍 Tray contacts -- they should be clean, free of oxidation or contamination. Rub them with an alcohol napkin or a lastic.
• 📏 Installation correctness – the card should be placed with gold contacts down and fit tightly to the stop in the tray. On some Xiaomi models (for example, Redmi). 9A) The slot has an asymmetrical shape – do not confuse the sides!
• 🔧 Integrity of the tray - if the plastic fixture is broken, the card may fall out or fit loosely. In this case, you will need to replace the tray (worth it). ~200–500 ₽).

If you have a hybrid slot (SIM + microSD), try inserting a memory card instead of a second SIM - sometimes the clamp mechanism weakens and does not fix the SIM properly. It is also worth checking whether debris or dust has fallen into the tray: blow the slot with compressed air (for example, a can of keyboard cleaning).

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If SIM-The card used to work on another phone, but not on Xiaomi, so try inserting it into another slot (if you have one.

2.Reboot the smartphone and reset network settings

Software failures are the second most common cause of error «SIM-The card is not installed. Let's start with the simplest: reboot your phone. Hold the power button for 10 to 15 seconds until the device turns off, then turn it on again. In 30 percent of cases, it helps to restore communication with the phone. SIM-card.

If the reboot didn’t help, reset your network settings:

1. Open the Settings. → SIM-maps and mobile networks.
2. Slip on Network Settings Reset (or Additional → Reset Wi-Fi, Mobile Network and Bluetooth on MIUI 14).
3. Confirm the action and wait for the reboot.

This procedure removes stored Wi-Fi networks, Bluetooth passwords and mobile Internet settings, but does not affect personal data. SIM-map must be determined.

If the reset didn't work, check the flight mode: sometimes it's activated accidentally (for example, through the Quick Settings Panel). SIM-Cards not disabled Enable the setting SIM-This happens after experimenting with two SIMs.

Verification of activation SIM-card-card

New SIM-The card may not work if it is not activated in the operator’s network. Even if you insert it into Xiaomi immediately after purchase, sometimes additional activation is required – especially for virtual carriers (for example, Tinkoff Mobile or Yota).

How to check for activation:

• 📞 Call from another phone to your number. SIM-If the voice of the autoinformer is heard ("Subscriber temporarily unavailable"), the card is not activated.
• 💬 Send. USSD-team: MTS: *111*01# MegaFon: *105# Beeline: *110*10# Television2: *155#
• 🌐 Go to the operator’s personal account through a browser or application (for example, “My MTS”) and check the status of the operator. SIM-map.

If the card is not activated, follow the operator's instructions.

1. Send. USSD-command, for example, *111*01*1# for MTS).
2. Wait 5-15 minutes and restart the phone.
3. Enter. PUK-code, if requested (find it on the plastic holder) SIM-map).

Attention: if you insert SIM-card from another operator (for example, replaced MegaFon on Tele2), wait for automatic registration on the network - it can take up to 24 hours».

4. Firmware update and IMEI verification

Failures in operation SIM-The cards are often associated with outdated firmware or damage to system files, for example, after updating to MIUI 14 Some Redmi Note 10 Pro users have encountered an error «SIM-The card is not installed because of a bug in the communication module:

1. Go to Settings → About the phone → System update.
2. Click on “Check Updates” and install the latest version of MIUI.
3. After the update, reset the network settings (see Section 2).

If the update didn’t work, check IMEI, your Xiaomi’s unique identifier, and if it gets damaged, your phone loses connection to the network.

1. Enter *#06# in the dialer - a 15-digit code (or two codes for two-symbol models) should appear.
2. If you see zeros or an error instead of IMEI, it's a knock-down, and it can happen after a failed firmware or factory reset.

To restore the IMEI:

• 🔧 Use the engineering menu (enter ##4636##, then select Phone Information and check status). IMEI).
• 📥 Download specialized utilities (for example, Maui) META or SN Write Tool, but beware – wrong actions can block your phone!
• 🛠️ Contact the service center if you are not sure of your abilities.

If IMEI is fine but the problem persists, try rolling back the firmware to the previous version. Instructions for specific Xiaomi models can be found on the 4PDA forum or in the official support group.

5. Diagnostics of hardware malfunctions

If the software methods did not help, the problem may lie in the hardware:

• 📡 The antenna module is damaged, often after the phone falls or moisture is ingested. SIM-The card, or the signal is constantly missing.
• 🔌 Oxidation of contacts SIM-tray -- if you dropped your phone in water or used it in humid climates, your contacts could corrode.
• 🛠️ Motherboard malfunction – if the phone does not see any SIM-card in both slots, possible failure in the modem.

For self-diagnosis:

1. Try inserting. SIM-Map to another phone – if it works, the problem is your Xiaomi.
2. Check if the phone is catching Wi-Fi and Bluetooth, and if it's not, it's possible that the wireless module is damaged.
3. Run the hardware component test through the engineering menu (#4636## → Phone information. Please note the status SIM and Network status.

If you suspect a hardware malfunction but are not sure of its cause, use the table below for preliminary diagnosis:

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If the phone fell or came into contact with water, don’t try to disassemble it yourself – contact the service.

The cost of repairing hardware faults in Xiaomi:

• Replacement SIM-tray: 300-800 ₽.
• Repair of the antenna module: 1,500–3,000 ₽.
• Diagnosis of the motherboard: from 1000 ₽ (spare-less).

Alternative solutions

If the standard methods didn’t work, try these less obvious but effective methods:

Reset to factory settings (will delete all data, but often solve software failures):

1. Go to Settings → About the phone → Reset settings.
2. Choose to erase all data and confirm.
3. After restarting, set your phone as new and check. SIM-map.

Manual setting of the operator's network:

1. Open the Settings. → SIM-maps and mobile networks → [Yours. SIM-map] → Access points (APN).
2. Add a new APN manually (options can be found on the operator’s website).
3. Save the settings and restart the phone.

Use Safe Mode (Safe Mode):

If the problem is caused by a conflict with the app, boot the phone in Safe Mode:

1. Press the power button, then hold your finger on the turn off option.
2. In the window that appears, select Safe Mode.
3. Check if it's being determined SIM-If so, remove the recently installed applications.

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If you use custom firmware (like LineageOS or Pixel Experience), the problem may be that it's not built properly. Try to get back to the official MIUI.

For advanced users: If you are confident in your skills, you can try flashing a modem through Fastboot.Instructions and firmware files look for on thematic forums (for example, XDA Developers), but remember: this is a risky procedure that can lead to the “bricking” of the phone.

7. When to contact the service center

If you’ve tried all the methods, Xiaomi still doesn’t see SIM-This is a clear sign of a hardware malfunction:

• 🚨 The phone does not determine any SIM-card.
• 🔌 The screen is displayed IMEI as zeros (000000000000000000000000000000000000000000).
• 💧 The phone fell into the water or was subjected to severe mechanical stress.
• 🔥 After connecting charging or headphones, the smell of burning appears.

Where to repair:

• 🏢 Official service centers Xiaomi - warranty repair (if the phone is warranty) or paid diagnostics: mi.com/ru/service/location.
• 🔧 Informal workshops are often cheaper, but the risk of running into unskilled specialists.

Average repair prices (in Moscow and the regions for 2026):

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Before visiting the service, make a backup of the data (via Settings → Additional → Backup or Mi Cloud). After the repair, you may need to reset the settings.

If your Xiaomi is guaranteed, don't bother disassembling it yourself, it will void warranty obligations. Contact the official service with a check and a phone box. The warranty period is up to 45 days by law, but usually problems with the service are not guaranteed. SIM-The card is decided in 3-7 days.

FAQ: Frequent questions about SIM-maps in Xiaomi