Why Xiaomi doesn’t see why SIM-map: all causes and solutions

You put it in. SIM-Xiaomi card, but phone persistently ignores its existence? No network, no phone, and the status bar says "No" SIM» Or "No Service"? This problem is familiar to many Redmi smartphone owners, POCO And Mi, from budget models to flagships, 80 percent of the time, it's self-solving, but it's important to diagnose the cause correctly.

We have analyzed hundreds of cases on forums. 4PDA, Mi Community and service centers to put together a complete problem-solving guide:

• 🔍 Checklist for quick diagnosis (from simple to complex)
• 🛠️ Step-by-step instructions for software and hardware malfunctions
• ⚠️ Warnings that will prevent the problem from worsening
• 📊 Compatibility table SIM-maps with Xiaomi models

Do not rush to carry the phone to the service - in 6 out of 10 cases, the problem is solved in 5 minutes without disassembling the device.

1.Verification SIM-Cards and slots: basic steps

Start with the Elementary: 90% of Recognition Problems SIM Even if the card worked before, it could have shifted, oxidized or damaged.

Extract. SIM-map and inspect for cracks/scraps|

Wipe the contacts of the card with a stripe or alcohol|

Try inserting the card into another smartphone|

Check if the tray is properly installed (for two-sim models)|

Make sure the tray is fixed before clicking.

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Pay special attention to the tray for SIM: in the Redmi Note models 10/11 and POCO X3/X4 Often there is a problem with incomplete closure of the slot. If the tray is dangling or not fixed, this is a direct signal of damage to the mounting mechanism (solved by replacing the tray for a short time). 200–500 ₽).

Also check:

• 📱 Type SIM-Xiaomi of recent years (starting with Redmi 9) supports only nano-SIM. If you have a micro-SIM with an adapter, replace it with a native nano.
• 🔄 Position in the tray: in two-sim slot models SIM1 Often more priority for the network. Try to move the card to another slot.
• 🌧️ Moisture/oxidation traces: green plaque on the slot or card contacts is a sign of corrosion. Clean with alcohol and dry with a hair dryer (cold air!).

⚠️ Warning: Never use abrasive materials (steelpaper, metal brushes) to clean your contacts, which breaks the coating and impairs conductivity.

2. Software glitches: from reboot to reset settings

If SIM-The card is good, but Xiaomi does not see it, it is the fault of the software:

The first step is forced reboot: pinch the power + Volume up for 10 seconds. If that doesn't work, reset the network settings:

1. Go to Settings. → SIM-maps and mobile networks → Resetting network settings.
2. Confirm the action (required) PIN-lock-screen).
3. Reset the device.

For models with MIUI 13/14 The newer path may be different: Settings → Memory and SIM-map → Settings SIM-map → Reset.

Updates to MIUI|

Installation of a new annex|

Falls/blows|

spontaneously (without apparent reason)|

Another event.-->

3.Problems with IMEI: How to Restore and Avoid Blocking

Loss of loss IMEI — A critical malfunction in which the phone loses communication with the operator's network:

• 📲 Incorrect firmware via Fastboot or TWRP.
• 🔧 Reset to factory settings without backup of NV-data.
• 🛠️ Maintenance of the motherboard (for example, after replacing the charging connector).

Check it out. IMEI You can set up → The phone. → General information or dial in the phone application *#06#. If instead of a 15-digit code you see null or invalid, start restoring.

⚠️ Attention: Recovery IMEI on models with Qualcomm Snapdragon 8xx (for example, Xiaomi 12/13) requires a special cable EDL And QFil, where you can block the modem forever, if you're not sure, you can contact the service.

For Redmi owners on MediaTek (e.g. Redmi) 9A/10A) A simpler way to do this is through Maui. META:

1. Download and install VCOM drivers for your model.


2. Connect your phone to your PC in Meta Mode (clamp Volume up + down when you connect USB).




3.In Maui META, go to the IMEI tab and enter the correct values.




4.Push Write IMEI and wait for confirmation.

4. Hardware malfunctions: from slot to motherboard

If the software methods didn't work, the problem is the hardware.

💡

Before disassembling the phone, check the warranty! Opening the case will void Xiaomi's warranty obligations. If the device is warranty, contact the official service center.

The most common hardware problem is contact damage SIM-In the models. POCO F3 redmi K40 The slot is located close to the edge of the board, and when the contacts fall, they can move away:

1. Remove the back cover (need a mediator and a hair dryer to soften the glue).
2. Disconnect the battery plume (!) to avoid short circuit.
3. Examine the contacts of the slot under the magnifier: they should be smooth, without black spots (a sign of overheating).
4. Check the integrity of the tracks from slot to processor (use a multimeter in vertebrae mode).

If the contacts are oxidized, clean them with an alcohol solution (at least 90%) and gently warm up with a hair dryer (temperature not higher than 200).°C) Recovery of the track break will require a soldering station and experience with BGA-chip.

5. Problems with firmware and modem

Unstable firmware (especially custom firmware) often causes communication loss.

• 📱 Installation Global ROM The model is designed for China (for example, Redmi Note 11 Pro).+ 5G china-fixed ROM).
• 🔄 Update through OTA interrupted.
• 🛠️ Installation of a modified kernel (custom kernel).

For diagnosis:

1. Check the firmware version in Settings → About Phone → MIUI version.
2. Compare it to the official website. MIUI Downloads.
3. If the versions do not match or firmware custom - perform a clean installation of official software.

Instructions for flashing through Fastboot:

1. Download the official firmware for your model (.tgz format).


2 Unpack the archive in a folder with the Mi Flash Tool.




3. Transfer the phone to Fastboot mode (clamp Power + Volume down).




4. Connect to the PC and start the Mi Flash Tool.




5. Select a firmware folder and press Refresh → Flash.




6. wait until the end (10-15 minutes).

💡

After flashing, be sure to reset to factory settings (Wipe Data in Recovery), otherwise conflicts with previous data are possible.

If the problem occurs after the update MIUI 14 → HyperOS, try to roll back to the previous version:

• Download the archive with firmware MIUI 14 for your model.
• Move it to the root of the phone’s memory.
• Go to Settings → About Phone → System Update → Three Dots → Select a firmware file.

6. Features of dual-sim models and eSIM

Xiaomi owners with two support SIM (Redmi Note 12 Pro+, Xiaomi 13T) Often encounter conflicts between physical cards and eSIM:

• 📱 The phone only sees one thing. SIM, The second “disappears” after the reboot.
• 🔄 eSIM activates but does not catch the network.
• 🛠️ Priority slot (SIM1) It doesn't work. SIM2 — yes.

Decisions:

1. Turn off automatic network selection: go to Settings → SIM-maps and mobile networks → Network settings and select the mode Only 4G/3G/2G (Not "Auto»).
2. Reset the settings. APN: Settings → SIM-maps and mobile networks → Access points (APN) → Reset to factory.
3. Check the priority SIM: firmware SIM1 It is used by default for data and SIM2 — For calls, change the settings to Settings. → SIM-map → Priority SIM.

For eSIM:

• Make sure your operator supports eSIM (in Russia – MTS, Beeline, Tele2).
• Check if the service is activated in the operator’s personal account.
• If the eSIM is not determined, go to Settings. → SIM-map → Add eSIM and re-download your profile.

⚠️ Note: In Xiaomi models with HyperOS (e.g. Xiaomi 14), the eSIM menu may be hidden. To activate it, dial ##4636## in the phone app, select Information and check eSIM status in the Telephony section.

7.When to contact the service: signs of serious breakdowns

If all of the above methods fail, the problem may be related to:

• 🔥 Overheating or short circuit on the motherboard (often after moisture is ingested).
• 📡 Failure of the radio frequency module (e.g., Qualcomm) WTR or MediaTek MT6xxx).
• 🔋 Damage to modem power chains (for example, after a failed battery replacement).

Signs for which you need to immediately contact the service:

• 📱 The phone does not turn on or cyclically restarts.
• 🔥 The body warms up in the processor area even in standby mode.
• 🛠️ Artifacts (strips, flickering) appear on the screen when trying to call.
• 📡 Engineer Mode does not have network signal data (RX Power = 0).

The cost of repair in official Xiaomi services (in Moscow, 2026):

Before the service visit:

1. Make a backup of the data (Settings → About Phone → Backup).
2. Check if the service is an official partner of Xiaomi (list on the website mi.com).
3. If the phone is warranty - do not open the case and do not sew it yourself!

FAQ: Frequent questions about SIM-maps in Xiaomi