The situation when the long-awaited new smartphone Xiaomi after turning on demonstrates the lack of network, can cause confusion for any user. SIM-A card or a "No Service" sign is a common problem that often occurs when a device is first started due to loose contact or software failures in the shell. MIUI.
Before you panic and carry the gadget to the service center, it is worthwhile to conduct a series of independent diagnostic actions. In most cases, the reason lies in the banal inattention when installing the module or settings of the region. Xiaomi, like any modern manufacturer, uses complex algorithms for working with network modules that require proper activation.
The next steps will help you fix the malfunction yourself 90% of the time, and we will look at both software solutions and physical tray manipulation, as well as rare but possible hardware defects.
Primary Diagnostics and Physical Connection Check
The most obvious and common reason for the lack of a network is the incorrect installation. SIM-When you take out the tray, you should pay attention to its orientation: the bevelled corner of the card must match the bevelled angle of the tray. Even a microscopic gap or a fraction of a millimeter shift can cause the contacts to not close.
Carefully inspect the plastic card itself for scratches, oxides or contaminants on golden contacts. If you use an old SIM hand-cut from Mini or Micro format in Nano, the edges can be uneven and interfere with the tight fit, in which case it is better to contact the operator for replacement with the correct card size.
⚠️ Warning: Never use homemade adapters or glue to fix SIM-This can lead to a tray getting stuck inside the case and damage to the reading mechanism.
Try to gently wipe the SIM card contacts with soft, lilaless cloth. Sometimes greasy finger marks create an insulating film that prevents signal transmission. After cleaning, set the module back up and make sure the tray snaps to a characteristic, barely audible click.
- 📱 Make sure that SIM-The map is set with golden contacts down.
- 🔍 Check the tray for no dust and foreign objects.
- 💳 Try installing the SIM card in the second slot if there are two of them.
- 🧼 Clean the contacts of the card with a soft eraser or an alcohol napkin.
Network settings and choosing the right mode
If the card is physically set correctly, but the phone still says "Not found" SIM-map, the problem may be in software settings. HyperOS shell or MIUI You can flexibly adjust the settings of each slot. Go to the Settings menu. → SIM-Maps and mobile networks and check if the desired slot is activated.
A common mistake is the wrong type of network. If your region has already abandoned 2G/3G standards, and the settings are forced to “2G Only”, the phone will not be able to register with the network, it is recommended to choose the mode “LTE Preferably” or “5G/LTE/3G/2G (auto)”.
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If you just updated your firmware, your network settings may have gone wrong, switch the network mode to 3G only temporarily, wait for the signal to appear, and then return the automatic selection.
It's also worth checking if the flight mode is on by accident, and sometimes the system can freeze in this state after a failure. 10-15 It's going to make the modem restart and try to find the network again.
Compatibility of SIM formats and 5G support
Xiaomi smartphones actively support the fifth generation networks 5G, However, special work is required for them. USIM-If you use a very old communication module, issued more 5-7 Years ago, the phone might see it as invalid or just not detect it in mode. 5G.
Now, telecom operators are replacing cards with new formats that support encryption and high speeds, and if your data plan is very old, you might need to replace the plastic in the carrier's cabin, which is free or cost a token amount, but solves a lot of problems with registering on new networks.
Also, make sure your plan is active and there are funds in the account. Some operators block outbound connections and network access with zero balance, which can be perceived by the system as no card, although usually in this case it comes SMS-notice.
Software reset and configuration update
When simple methods don't work, you need to do more in-depth tweaking of your system settings. Network resets don't delete your personal files, contacts or apps, but bring back everything related to Wi-Fi, Bluetooth and mobile back to factory settings.
To perform the reset, go to the Settings section. → Connection and sharing → Reset Wi-Fi, mobile networks and Bluetooth. Confirm the action and wait for the device to restart. SIM-map.
☑️ Checklist resetting network settings
Another effective method is to update the APN configuration (Access Points). Although this is more likely to affect mobile Internet, the correct APN settings can help the phone to correctly identify itself in the operator's network. They are usually loaded automatically, but if they fail, they can be entered manually by taking data from your carrier's website.
IMEI check and modem diagnostics
One of the most important diagnostic steps is to check your status. IMEI (Equipment ID if the phone can't see SIM-The card may have fallen off the modem itself. Type *#06# in the dialer if the screen displays valid numbers. IMEI For both slots, this is a good sign.
If you see a numeric text, a zero, or a message, "IMEI null," it indicates a serious software or hardware problem with the communication module, and Chinese versions of smartphones that are flashed to the global version sometimes fly off the certificate, resulting in the loss of IMEI.
| IMEI status | Probable cause | Decision |
|---|---|---|
| Numbers are displayed | Problem with SIM or settings | SIM Replacement, Network Reset |
| Drawings or Null | Failure of firmware or modem | Flashing, service. |
| One number is there, no other number. | Failure of the second slot | Use slot 1, repairs |
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The absence of IMEI in the diagnostic menu is a critical sign that requires reflashing the device or contacting the service center.
Hardware malfunctions and contacts
If software methods are powerless, consider physical damage. The fall of a new phone could have caused the plume connecting the motherboard to the bottom plume where the SIM reader is located. In the new Xiaomi models, the design is quite dense, and the impact can disrupt contact.
Also, don't rule out factory defects in the reader (contact group), even new devices have soldering defects, and if the phone is new, don't try to disassemble it yourself, so as not to lose the warranty.
⚠️ Attempt to repair the new Xiaomi smartphone by disassembling the case automatically cancels the manufacturer’s warranty obligations.
Check if the contacts inside the tray have oxidized. Sometimes when there is high humidity or moisture (even if the phone is not sinking), plaque forms on the metal. Careful brushing with a toothbrush soaked in isopropyl alcohol can help, but only if you are confident in your abilities.
Regional features and blockages
When buying a smartphone imported from China (Global Version or CN Version), you can face locking by region, and some Chinese models may not work properly with SIM cards of certain operators or require specific frequency settings.
There is also the notion of operator-hosted devices: If the phone was bought from hand and previously used with a SIM card of a particular foreign operator, it can block the operation of other cards. Check the lock status on the menu or through special codes.
How to check the lock of the phone?
In rare cases, changing your region in your phone settings helps. Go to Settings → Additional settings → Region and select your country of residence or carrier country. This can activate the correct setting profiles for local networks.
When you need to contact the service
If you have tried all of the above methods, including resetting settings, checking IMEI replacement SIM-The card is known to be functional, but the result is negative - the problem is of a hardware nature. This can be a failure of the power controller, damage to the antenna module or the collapse of components on the board.
Since this is a new phone, the most sensible step is to go to the store or authorized service center Xiaomi.
Collect all the checks, boxes and kits, and describe to the specialists all the manipulations you have done, which will save time for the diagnosticians and speed up the process of replacing the device or repairing it under warranty.