What to do if the Xiaomi 15 Ultra cannot make or receive calls?

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Accepted Answer

If the Xiaomi 15 Ultra cannot make or receive calls, please refer to the following troubleshooting steps:
1. SIM card issues can cause calling failures. Please check whether the SIM card has sufficient balance and is not suspended by the carrier.
2. Improper SIM card installation or SIM malfunction can affect calling functions. Please remove and reinsert the SIM card, or try using another SIM card to test.
3. Poor signal or external interference can prevent the phone from connecting to the network. Please move to another location with better signal coverage and try again.
4. Call forwarding or blocklist settings can prevent incoming calls. Please check the Phone App settings and disable these features if they are enabled.
5. VoLTE may be disabled, which can affect calling under some network conditions. Please enable VoLTE in the phone settings and try again.
6. Temporary system or network issues can prevent calls from working. Please restart the phone and try again.
7. Please check for system updates and install the latest version to ensure all network and call functions are up to date.
8. If the issue persists after trying the above steps, please contact the after-sales service for further inspection.