When a Xiaomi smartphone suddenly stops making outgoing calls, it can be caught off guard at the most inopportune moment: the screen lights up, numbers are dialed, but the beeps are not heard, or the connection breaks down after a second, a common problem that owners of devices based on MIUI and HyperOS, and most often it is solved by software methods without going to the service center.
The reasons may lie in the banal failure of the network module, incorrect settings after updating the system or even in the physical contamination of contacts. SIM-Before you panic and carry the phone to the master, it is worthwhile to diagnose yourself, consistently eliminating simple factors.
Recovery of call function requires careful attention, because the problem can be on the operator's side, and in the software of the device itself. We will look at methods from the simplest reboot to more complex manipulation of the engineering menu, the main thing is to act consistently to accurately identify the source of the malfunction.
Primary diagnosis and verification SIM-map
The first step to be taken is a basic status check. SIM-Often users forget that the balance sheet may have run out of funds, or the operator is carrying out preventive work. 4G or LTE, It doesn’t just show “No Network” or “Emergency Calls Only».
Physical contact of the card with the phone is a weakness of any mobile device. Dust, oxidation or simply displacement of the tray can cause the communication module to stop seeing the SIM correctly. SIM-So if you have a two-symbol machine, try moving the card to another slot.
⚠️ Warning: Never remove or insert SIM-This can cause the network controller to short circuit and burn. Always turn off the device before working with the tray.
If the problem persists after the reboot, it makes sense to check if the phone sees the card at all. Go to the settings and see if it's active. SIM-Sometimes the system can programmatically shut down the module after a failure. SIM-If the phone is calling on another device, it means that the problem is in the settings or hardware of your Xiaomi.
Network settings and parameter reset
If the physical check didn't work, the network settings were likely to be lost, and the carriers periodically change the access settings, and the automatic update may not work correctly, in which case manual network selection or a complete reset of mobile Internet settings and calls helps.
First, try switching the network type. Go to the settings menu. SIM-maps and select the preferred network type. 5G or LTE, Try to temporarily switch to 3G or 2G. If the calls go, it means the problem is in the coverage of your operator or in the antenna module of the phone, which can not hold a stable signal of high standard.
A more radical but effective method is to reset your network settings, which will not delete your personal photos or contacts, but will return all your Wi-Fi, Bluetooth and mobile settings to factory values, often solving the problem of your phone getting stuck in the wrong configurations.
☑️ Checklist resetting network settings
Once the reset is done, the phone can log back in for a while. Don't worry if it takes a couple of minutes. If that doesn't work, you may need to manually configure the APN access points, although voice calls are rarely required. The focus is on whether LTE Only is enabled, as voice calls over LTE (VoLTE) are not yet fully supported by carriers in some regions.
Work with flight mode and reloading of modules
Sometimes the smartphone's network module just freezes in the background, stops sending signals to the base station. The fastest way to shake the system is to use flight mode, which is a software shutdown of all radio modules, which forcibly restarts them when they are turned off.
Turn on the flight mode through the notification curtain or through Settings -> Connect and share. Wait at least 10-15 seconds for the phone to completely turn off data transmission. Then turn off the mode and wait for the network icon to appear. This method helps in 60% of temporary crashes.
If a quick reset didn't work, you can try a deeper reboot of communications services, which doesn't require you to go to the engineering menu right away, just turn off the phone completely, wait a minute and turn it on again, and unlike a quick reboot, a full shutdown clears temporary memory buffers where erroneous login data could have been recorded.
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Use the code combination ##4636## to log in to the test menu, where you can select "Phone Information" and click "Turn off radio" and then "Turn on radio" to force the modem to restart without turning off the phone.
It's also worth paying attention to whether your phone is overheating. At critical temperatures, the processor can restrict the operation of power-intensive modules, including the radio part, which makes it impossible to make a call.
Application conflicts and blockers
Don’t discount software conflicts. Call apps, number detectors, or spam blockers you install can take over telephony management and not work properly, especially after an Android update, when older versions of apps are no longer compatible with the new system.
Check which app is set as “Default Call App.” Go to Settings -> Apps -> Application Management -> Three dots on the top right -> Default Apps -> Phone. Make sure you choose the standard MIUI Dialer or Google Phone, rather than third-party software like Truecaller or Call Master if you are not sure they work properly.
Also worth checking is permissions. Android's current security system strictly controls access to the microphone and telephony. If the call app has been stripped of its license, it will not physically be able to initiate a connection. Go to the specific application settings and make sure that all the necessary switches are activated.
| Type of application | Probability of conflict | Action. |
|---|---|---|
| Number-defining | Tall. | Disable or delete |
| Antivirus | Medium | Check the security settings |
| Call manager | Critical | Reset the settings |
| Cleaning up memory | Low. | Eliminate system processes |
⚠️ Warning: Third-party memory accelerators and cleaners often aggressively terminate the system processes responsible for communication. Add Xiaomi and Google system services to your antivirus' exclusion list (whitelist.
Engineering menu and hidden settings
For advanced users, it is possible to fine-tune the radio module through an engineering menu, a powerful tool that allows you to force changes in network settings, reset base station preferences, and check the status of IMEI. However, you need to use it very carefully.
To enter the menu, open the “caller” and dial the code ##4636##. If the code is not working, your firmware may be blocking access, and you will need to install a special application from the Play Market Store.
If you have a value that contains "NR" (5G) and you are in a poor coverage zone, try switching to "LTE only" or "GSM only" to check, and the "Run Ping Test" button to show if there is any response from Google servers is also useful.
What if IMEI becomes “Null” or “Unknown”?
In the same menu you can find the button "Switch". SMS-Preference. Make sure the value is worth it «GSM» or «CDMA Auto, which is your operator's, and the wrong choice of standard can block not only calls, but also SMS messages.
Resetting to factory settings as an extreme measure
If none of the above methods have helped to recover outgoing calls, the final software argument is a complete factory reset, which will delete all your data, so be sure to back up your contacts, photos and documents before you start.
Reset eliminates any deep-seated file conflicts that may have arisen as a result of a failed update or viral activity. Once turned on, the phone will be as new, and if the problem was software, it will disappear. If after a clean start without installing unnecessary applications, the call does not work, the problem is, alas, hardware.
To perform the reset, go to Settings -> About Phone -> Settings Reset -> Erase all data. The process will take a few minutes, after which the phone will restart. Don't rush to install all the applications at once - check the connection on the "clean" system.
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If after a full reset and check with another SIM-Calls still do not go on the card, the probability of hardware breakdown of the antenna or plume is more than 90%.
Hardware malfunctions and service call
When software methods are exhausted, we have to talk about hardware. In Xiaomi smartphones, a common cause of communication loss is the antenna plume’s departure after falls or vibrations, and the communication module itself on the board can fail, especially if the phone has been exposed to moisture.
Notice the behavior of the phone: if it warms up a lot on top even in standby mode, or if the network icon constantly disappears and appears, these are sure signs of a malfunction of the radio part, in such cases, self-repair without equipment and skills is impossible.
Do not try to disassemble the phone yourself if you do not have experience, as you can damage fragile plumes or break the tightness of the case.