If any incoming call is the same,
It is recommended that you contact the operator for commissioning and related charging if the CID function is not enabled.
1. It is recommended that you find the Phone application in Setings-Apps, and then try to delete the data and clear the cache (if not found, please select -> in the lower right corner to display the system process).
2. It is recommended that you back up data and try to restore the factory settings or upgrade the system to the latest version.
If only specific incoming calls display unknown numbers, the probable causes are as follows:
1. The other party uses the network IP phone software to make calls.
2. The peer end screens its own number in accordance with some technical methods, so that the local number is not sent.
3. The other party has handled relevant services in the operator department, so that he/she does not send his/her own number when making a call.
4. The other party makes a call from another country, but the information exchange between operators in different countries may be incompatible. As a result, the number cannot be displayed properly during the transmission process.
This is not a problem of the mobile phone itself, so you can use the mobile phone easily.