When someone calls me to remind me that I can't get through or the number is empty without turning off my phone, I can get a short message to remind me. My mobile phone is.

The common reasons why mobile phones can't answer calls and their solutions are as follows:

First, check whether the mobile phone is in arrears, and it is recommended to pay for recharging;

2. Check whether the mobile phone is set with call forwarding, flight mode, call barring, etc. Suggest canceling and try again;

3. Check whether the function or signal of the mobile phone is normal. It is recommended to try again in another location.

4. If roaming to other places can't be used, it is suggested to check whether the local network signal is normal and whether the number has been roaming.

5. Try to restart the phone or change the phone for testing;

6. You can take your mobile phone card to the local business hall for testing or replacement.