When a Xiaomi smartphone stops receiving incoming calls or blocks outgoing ones, it can be taken by surprise at the most inopportune moment. Often users are faced with the fact that the subscriber hears short beeps or a message about employment, although the phone is in the network area and is working, the reason for this behavior of the device can be both accidental activation of the Do Not Disturb function, and more complex system conflicts or locks by the operator.
Owners of Xiaomi Redmi and Poco know that the shell MIUI or HyperOS has advanced traffic filtering functionality, which by default can be set too aggressive. Before you carry the gadget to the service center, you should check a number of settings that are responsible for routing voice traffic. In most cases, the problem is solved by software in a few minutes without losing personal data.
In this article, we will discuss all possible blocking scenarios in detail and offer proven algorithms for eliminating them. SIM-maps and reset network parameters to factory values.
Checking activated modes of the phone
The first step is to eliminate the influence of system modes that limit the functionality of the device. The most common culprit for the lack of audio notifications and blocking incoming ones is the Do Not Disturb mode. On Xiaomi smartphones, it can be configured to skip calls only from selected contacts, creating the illusion of a complete failure of the phone.
To check your current status, lower the swipe notification curtain from top to bottom. Make sure the crescent icon isn't illuminated with the active color. If the mode is on, click on it to deactivate. It's also worth looking at the settings for this mode's running time, as it could have turned on automatically on schedule.
Another important parameter is call forwarding. A randomly set forwarding to another number or voicemail can give the impression of being blocked. Check the settings in the call menu to make sure that all incoming ones are coming directly to your device.
Notice the network status in the top right corner of the screen, if you're showing an "R" or "E" icon instead of 4G or LTE, the quality of the connection can be unstable, leading to a call reset, and in such cases, short-term air mode activation helps.
Set up blacklist and filtering in MIUI
The MIUI shell is equipped with a powerful built-in antivirus and security module that takes over contact management, which is where the reasons for blocking most often hide if you accidentally add an important number to the list of unwanted or enable filtering anonymous calls.
To access the lock settings, you need to open the standard Security app (green shield icon). At the bottom of the screen, find and select Lock. This displays the statistics of blocked calls and SMS, and there are exception lists.
- 📞 Blacklist: Check if the blocked numbers are anyone you plan to call or who you expect to call.
- 🔒 Blocking Unknowns: Make sure the “Block Hidden Numbers” option is not activated if it is important for you to take calls with a identifier.
- 📵 Do Not Disturb: There may be additional exceptions to this mode in the same menu, which is worth checking back.
If you find the right number in the blacklist, just click on it and select the option to delete or unlock, and in the lock settings you can reset all the rules to the factory, which often helps if you are confused with numerous filtering options.
It is important to note that security updates can change the location of some menu items, and if you do not find the options described, search for settings by entering the “lock” request.
Reset network settings and call parameters
When software conflicts affect network modules, simply restarting the phone may not help, and in such cases, a deeper reset of communication settings is required, which will return APN settings and the preferred network type to their original state.
To perform this operation, go to the Settings menu. Next, select Connection and Sharing (or «SIM-Maps and mobile networks in older versions MIUI). Find the item “Reset your Wi-Fi, mobile network and Bluetooth settings».
The system will alert you that all saved passwords from Wi-Fi and Bluetooth devices will be deleted. This is normal behavior, as the entire network stack is reset. Confirm action and wait for the communication modules to reboot.
☑️ Checklist before network reset
Once the phone is restarted, it will re-register on the operator's network if the problem was caused by an error in the voice protocols (VoLTE/VoWiFi), This step should eliminate it. Make sure that the settings are in place. SIM-Cards activated by the "Voice calls" item».
Management SIM-map and action by the operator
Sometimes the reason lies not in the smartphone itself, but in the subscriber’s profile or physical condition. SIM-Operators can block outgoing calls if there is a negative balance or if you suspect spam activity from your number.
Contact your operator’s support team or use your personal account in the app, ask them to check the status of the locks and the availability of services such as Anti-Detection or Parental Control, which may limit communication.
If the tariff is all right, it is worth checking the physical contact. SIM-Remove the tray, wipe the SIM card contacts with soft cloth and insert it back in, make sure the chip is free of visible damage and scratches.
⚠️ Attention: If yours SIM-map used more frequently 5-7 Old cards with a lot of plastic cut out often work unstable in modern slots. SIM-cards in the operator's cabin with the number.
It is also worth trying to rearrange. SIM-card to another slot (if there are two) or to another phone to exclude the malfunction of the communication module in the smartphone Xiaomi.
Specifics of unlocking for different Xiaomi models
Different Xiaomi, Redmi and Poco smartphone models may have different interfaces and settings. Budget models of the Redmi Note series often use a simplified menu, while flagship Mi and Xiaomi have advanced developer settings.
| Series of devices | Features of the call menu | Location of the lock settings | Recommended action |
|---|---|---|---|
| Xiaomi (Mi) | Google Phone / MIUI Dialer | Settings → Applications → Phone | Cleaning the app cache |
| Redmi Note | MIUI Dialer | Security app → Blocking | Checking the blacklist |
| Poco | Google Phone | Phone. → Settings → Locked numbers | Resetting call settings |
| Xiaomi 13/14 | HyperOS Dialer | Settings → SIM-map | Network type switching |
With newer HyperOS devices, the interface is more minimal, locking settings are often integrated directly into the Phone app through a three-dot menu in the corner of the screen, and older models with MIUI 12 and below should pay attention to the Security app, as it focuses on the core functionality.
Hidden codes for diagnosis
If you recently updated your firmware and the problem appeared immediately after that, there may have been a conflict of configuration files, in which case the network reset described in the previous section helps.
Radical methods: resetting and flashing
If none of the softer methods worked, then more drastic measures remain: Resetting all settings to factory (Hard Reset) is guaranteed to eliminate any software errors, but requires prior data backup.
Before starting the procedure, make sure the battery is at least 60 percent charged. Go to Settings → About Phone → Settings Reset → Erase all data. The device will reboot and return to the “out of the box” state.
⚠️ Note: Before performing a complete reset, be sure to remove SIM-microSD card and memory card, which will prevent the accidental deletion of important files and reset of the operator's network settings.
In extreme cases, when the problem is hardware in nature or is related to damage to the system partition, it may be necessary to flash the device through the computer using the Mi Flash Tool utility. ADB-team.
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Use the "Second Space" or guest mode to check the operation of calls. If the guest profile calls pass, then there is a problem in the settings or applications of your main account.
Remember that self-flashing can deprive you of warranty, so this method should be resorted to only if other methods are exhausted.
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90% of the problems with blocking calls are solved by checking the blacklist in the Security app or resetting the network settings.