1, forced restart, some softwares occupy unstable system resources when running, which can be solved by restarting. Of course, this only limits the situation of rare crashes?

2. If it still doesn't work, cclean, slim down the phone.

3. If it is still the same, kill the virus and restore the factory settings of the mobile phone.

Supplement:

The reasons are analyzed as follows:

1. Caller ID is not enabled on your phone.

2. Or there is something wrong with the mobile phone system. It is recommended to refresh your mobile phone system. You say the call belongs to the place, and Apple follows it. More powerful attribution function, need to escape.