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

Method 1: check whether the mobile phone is in arrears, and suggest paying for recharging;

Method 2: Check whether the mobile phone is set with call forwarding, airplane mode on and call barring. It is recommended to cancel and try again.

Method 3: check whether the function or signal of the mobile phone is normal, and suggest changing the mobile phone or trying again;

Method 4: If roaming to other places cannot be used, it is recommended to check whether the local network signal is normal and whether roaming authority has been opened for this number;

Method 5: try to restart or replace the mobile phone to see if you can answer the phone;

Method 6: Take the mobile phone card to the local business hall for testing or replacement.