SIM card can't answer the phone, but it can send and receive short messages and use data traffic.

1, check the status of the mobile phone to see if it is stopped;

2. If there is a signal that can't answer the phone normally, it is recommended to inquire whether to set the call forwarding or flight mode;

If there is no signal, you can ask the people around you if there is such a situation. If this happens, it may be that the network signal at your location is abnormal, so you can contact 10086 for manual feedback.

If the people around you don't have this situation, it is recommended to change the mobile phone for testing.

If the normal use of the hand changer indicates that it is a problem with the mobile phone, it is recommended to check the settings of the mobile phone;

Changing the mobile phone doesn't work properly. I suggest changing the card in the business hall.