The situation when the screen of a smartphone lights up during an incoming call, but instead of a contact name or subscriber number, you see only a void or a standard stub, is familiar to many owners of Android devices. On Xiaomi smartphones, this problem is especially common due to the aggressive optimization of the MIUI shell or HyperOS, which can ruthlessly “kill” the background processes necessary to correctly display information about the caller.
The lack of identification can be caused by a banal malfunction of the SIM card, a conflict of system applications or even damage to the cache of the phone book. In this article, we will discuss in detail all possible reasons why the number detector ceases to function, and provide step-by-step instructions for restoring the call system.
In most cases, the problem is software-based and solved in a few minutes without going to the service center, but ignoring such failures can lead to you skipping important calls from unfamiliar numbers, mistaking them for spam, or not being able to identify an urgent call.
The main reasons for the failure of the number on Xiaomi
The first thing to understand is that the architecture of calls in modern versions of Android based on MIUI is divided into several layers: the modem is responsible for receiving the signal, the system application Phone is responsible for displaying the interface, and often third-party services or cloud functions of the manufacturer are responsible for recognizing spam and names from the database, and a failure at any of these levels leads to the fact that Caller ID is not displayed.
Often the culprit becomes himself. SIM-If the contacts are stored on it, and not in a Google account, then at the slightest desynchronization or physical wear of the chip, the phone simply does not have time to read the data before the beeps begin. It is also worth considering that some operators stop transmitting information about the name of the subscriber, if the number determination service on the provider’s side is not activated.
Another common reason is the conflict between a standard call app and third-party identifiers like Truecaller or Yandex.The system may try to hand over call management to both applications at the same time, resulting in a freeze in the incoming call interface.
Configure access rights and permissions for the phone application
The most common mistake users and the system have made is that the app that handles the calls doesn't have the necessary permissions. In newer versions of Android, access rights have become more stringent, and after updating the firmware, some settings may reset, so you need to manually check if the Phone app has access to contacts.
To do this, go to Settings → Apps → All apps and search the list for Phone (or Google Phone if it is installed by default). Click on App Permissions and make sure the slider opposite Contacts is active. Without this right, the system cannot physically match the incoming number to the entry in your phone book.
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If the permission slider is already on, try turning it off, waiting 5 seconds, and turning it on again, and this will force you to restart the MIUI security security process.
Also, pay attention to the item "Master on top of other applications." If this feature is disabled, the incoming call interface may simply not overlap the current screen, creating the illusion that the call is not displayed. Make sure that this option is activated in the Additional permissions section.
Problems with synchronizing contacts Google and Xiaomi Cloud
If the number is not identified, although it is definitely in the contact list, the problem lies in sync. Xiaomi smartphones often offer to save data in the Mi Cloud, but the system application Phone can by default search for it in the Google database, or vice versa. This data stratification leads to the fact that when an incoming call the phone does not see matches in the active database.
Check your contact display settings. Open the Contacts app, click three dots or the menu button, and select Display settings. Make sure that checks All Contacts and selects all accounts, including SIM-Sometimes forced synchronization through Settings helps. → Accounts and synchronization → Google.
⚠️ Note: If you recently changed your Google account password, your contact sync may have stopped. Go to your account settings and click Sync to update your data.
In some cases, exporting contacts to a.vcf file and then importing them back helps, which clears the database of hidden indexing errors, just back up, delete all contacts (save the file beforehand), and import them back from the file.
Resetting the application settings and cleaning the cache
The accumulation of temporary files and errors in the cache of the Phone application is a classic cause of instability. The system may mistakenly assume that the number is determined and not display the interface, or the cache overflows and blocks new identification requests, clearing this data is safe and does not delete your contacts or call history.
Follow the following steps to reset the state of the application:
- 📱 Go to Settings. → Annexes → All applications.
- 📞 Find the Phone app (or Google Phone").
- 🗑️ Press "Clear" →"Clear the cache" and then "Clean it all" (if the problem persists).
- 🔄 Restart the device to apply changes.
If the problem persists after cleaning the cache, the configuration files of the application itself may be damaged, in which case it is worth trying to update the application through the Google Play Store or GetApps. Often developers release patches that fix compatibility bugs with specific versions of Android.
☑️ Checklist for call diagnostics
Conflicts with third-party number determiners
Many users install additional spam detection apps, such as Truecaller, Kaspersky Who Calls, or Yandex with Alice, which intercept the incoming call, check the number on its database, and then hand over control to the system. If this chain crashes, you can see an empty screen or a standard stub.
To avoid conflict, try temporarily disabling or removing the third-party determinant. If the built-in determinant worked fine after that, then the problem was compatibility. In the settings of the third-party application, find "Integration" or "Calling" and reconfigure it according to the recommendations for your version of MIUI.
HyperOS and newer versions of MIUI have their own antivirus and determinant that can conflict with external solutions, and it is recommended to use only one active number detector to avoid double interception of the call.
| Annex | Type of work | Possible conflict | Recommendation |
|---|---|---|---|
| Google phone | Systemic | Low. | Used as the main |
| Truecaller | sideways | High-pitched | Disable integration |
| Yandex (Alice) | sideways | Medium. | Set a priority |
| Kaspersky | Antivirus | Medium. | Just leave the defense. |
Specificity of VoLTE and HD-calls
VoLTE (Voice over LTE) technology allows high-quality voice transmission over 4G networks, but it requires support from the operator and the correct setting of the phone. If the service is activated on the tariff, but the phone is configured incorrectly, there may be problems with the transmission of caller data (CLI - Calling Line Identification).
Try switching the network mode. Go to Settings. → SIM-maps and mobile networks → Choose. SIM → Network type. Switch from "Preferred" 4G" on"3G/2G" And see if the caller's name shows up. 3G everything works, so the problem is in the settings of VoLTE or operator coverage.
How to set up VoLTE on Xiaomi?
It is also worth checking whether Do Not Disturb or Unknown Number Block mode is enabled. In some configurations, these features may hide the call interface if the number is not saved in contacts or flagged as potential spam.
Network resets and radical methods
If software methods didn't help, maybe network settings or operator profiles went wrong. Network settings reset will return APN, Bluetooth and Wi-Fi settings to factory values, but won't delete your personal files or contacts. It's a safe and effective step.
To perform the reset, go to Settings → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth. Press Reset and confirm the action. Once the reboot is done, the phone will re-register on the operator’s network, which often solves the problems with the transfer of the call ID.
⚠️ Note: After resetting your network settings, you will need to re-enter your Wi-Fi passwords and re-address Bluetooth devices such as headphones or watches.
As a last resort, if the problem only manifests itself after installing a specific firmware update, consider rolling back on a previous version or waiting for a patch from the manufacturer. Errors in the telephony framework system libraries are sometimes found in beta versions of MIUI.
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If resetting network settings and cleaning the cache did not help, the problem may be on the side of the operator – check with technical support, is not blocked service number on your tariff.