1, is the person around you using it normally? If not, it is a network problem.

2. If other people are normal, change the phone and card, and confirm whether the problem is the phone or the SIM card. Go to the nearest business hall to check the SIM problem and the mobile phone problem, and restore the data before leaving the factory. If the problem still exists after recovery, go to the nearest mobile phone after-sales test.

3. There is no mobile signal coverage in this area, so no signal will be displayed.