Calls to Xiaomi do not pass: fixing communication problems

When a smartphone suddenly stops making or accepting calls, it can take you by surprise at the most inopportune moment. owners of Xiaomi and Redmi devices often find that after a system upgrade or change SIM-The phone can't connect to the phone, which is annoying, because communication is a basic function of any gadget, and failure to do so paralyzes the work.

The reasons for the call not being made can be both software and hardware. Sometimes the problem lies in the failure of the operator's base station, and sometimes the faulty configuration of the network modes in the MIUI menu is to blame. It is important not to panic, but to sequence all possible faults, from simple reboots to complex manipulations of the engineering menu.

In this article, we will discuss in detail the algorithms that will help restore the normal operation of the phone, you will learn how to properly configure VoLTE, why resetting network settings is often more effective than a complete reset, and in which cases the problem requires intervention in the hardware of the device.

Diagnostics of the problem: analysis of symptoms and indicators

Before you start radical treatments, you need to understand exactly the nature of the malfunction. The behavior of the smartphone when trying to make a call can give you the clue. If the screen goes out immediately after dialing, and after a few seconds returns to its original state without horns, this can indicate a call lock or balance problems.

Note the status bar indicators, and if the network icon is gone or the cross is on, the device has lost communication with the base station, and then the network search can be blocked by a software failure of the communication module, and if you see a 4G or LTE icon, but the call is broken, the problem may be a conflict of data standards.

⚠️ Note: If you hear a short horn or a voice-activated automatic response from an operator with an error code (e.g., 00000, 00003), write down this code.

It's also worth checking if the problem is replaying with all contacts or only certain contacts. Sometimes users accidentally blacklist or activate the "Do Not Disturb" mode, which blocks incoming calls from strangers. Checking these settings will take a minute, but save hours of troubleshooting.

• 📱 Check for lock icons or flight mode in the notification curtain.
• 📞 Make sure the problem is not related to a specific contact or number.
• 💳 Remove and insert. SIM-The map is re-checked by checking the integrity of the contacts.
• 🔄 Restart the device to eliminate temporary failures in the communication module.

Basic network settings and operating modes SIM-map

The most common reason why Xiaomi doesn't call is because of the incorrect choice of the preferred network type. The settings menu often has an automatic choice, which can "fly" between the areas of uncertain reception. 4G and 3G, Breaking the connection. Forced setting of the standard GSM/WCDMA or LTE can stabilize the signal.

For dual-symbol devices, it is critical to correctly configure the priority of calls. SIM-The card is used for the Internet, and the second one is used for calls only, the system can try to make a call through a data channel, which is currently unstable. SIM-maps in the menu Settings → SIM-Mobile networks often solve the problem.

VoLTE (Voice over LTE) is a feature that allows high-quality voice transmission over a 4G network. However, not all operators and tariff plans support this technology correctly. If the option is enabled, but the service is not activated on the operator side, calls may not pass or break.

Try to manually select a carrier instead of automatic mode. Sometimes the phone clings to a weak signal of the long-distance repeater instead of a powerful signal from the nearest tower of another operator (roaming) or simply sticks on one frequency.

Network resetting: an effective solution method

If simple switching didn't work, a deeper intervention would be needed, and network resetting is a secure procedure that doesn't delete your personal files, contacts, or photos, but only returns your mobile and Wi-Fi connection settings to factory values.

To do this, go to Settings → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth. Once confirmed, the phone will reboot and you will have to re-enter passwords from Wi-Fi networks. However, this often resolves conflicts in the configuration of APNs and carrier profiles.

⚠️ Note: After resetting your network settings, your stored Bluetooth devices and Wi-Fi passwords may be removed. Make sure you remember the keys to important access points in advance.

In some cases, especially after the MIUI or HyperOS firmware update, APN settings may fly out. Check them in the mobile network menu. If the list is empty or the settings look odd, click Reset or Restore Default at the bottom of the screen.

💡

Before resetting your network settings, take a screenshot of the current APN settings if they have been manually changed (e.g. for corporate internet) to quickly restore them.

After the reset, wait 2-3 minutes until the phone is fully registered on the network. Do not rush to make test calls immediately, give the communication module time to establish a stable connection with the base station.

Checking of blocking and restriction lists

Often users block the possibility of calling themselves, forgetting about the activated functions. First of all, check the Do Not Disturb mode. At Xiaomi, it can be configured to skip calls only from selected contacts, and everyone else will be reset automatically.

You should also check out the “Security” app" →"Blacklist. It may have accidentally hit the number you're trying to call, or activated locking all unknown numbers, a common problem where the phone silently rejects calls without showing them in the log.

If you have an unconditional forwarding on your number to another number (for example, voicemail or an old phone), incoming calls will go there without calling on the current device. USSD-Operator commands or in call settings.

Problems with VoLTE and HD-sound

VoLTE is designed to improve communication quality, but in practice it often causes Xiaomi to not call. LTE-a channel that may be overloaded or unstable in your area instead of switching to a regular voice channel 2G/3G.

If you experience persistent failures, try to force VoLTE to turn off. → SIM-maps and mobile networks → Choose. SIM → Use VoLTE. Once disconnected, the phone will use the classic switching method, which can reduce sound quality but improve connection reliability.

In some cases, the hidden menu of engineering tests allows you to fine-tune LTE settings. However, using this tool requires caution. Incorrectly changing the values can lead to a complete loss of the network.

⚠️ Note: Entrance to the engineering menu is by code ##4636##. Do not change values that are not sure, especially those related to the preferred network type, unless you understand the difference between the two. LTE only GSM/WCDMA/LTE.

It is also worth checking whether yours supports you. SIM-map HD-Older cards that were released years ago may not work properly with the new voice encryption standards used in today's networks. 4G.

Hardware malfunctions and module repairs

If the software is exhausted and the problem persists, there is a high probability of hardware failure, most often the antenna module or the plume connecting the board to the case fails, and this often happens after falls or moisture, even if the phone looks whole.

Another common cause is contact oxidation SIM-Over time, dust and moisture create a plaque that prevents the card from being read properly. SIM, but cannot register on the network to make calls.

For diagnosis, you can try to install SIM-If it works, it's your Xiaomi, and it's also worth checking if the bottom of the phone is heating up when you try to call, which may indicate a short circuit in the antenna circuit.

💡

If the reset and flashing did not help, SIM-card in other phones works – requires diagnosis of the antenna module in the service center.

In rare cases, the problem lies in the processor or modem itself, especially if the phone has undergone unqualified repair or rolling of BGA balls.

Frequently Asked Questions (FAQ)