Mobile phones are often shut down, so it is normal to restart them.

1. If the mobile phone is turned on after being in arrears, it needs to be restarted to resume normal use of the 4G network.

2. Ask others around if they have this problem. If there is the same problem, there may be something wrong with the local network. You can contact local 10086 for optimization.

3, change the phone test, if it can be used normally, it may be that there is something wrong with the phone, you can contact the phone for after-sales consultation;

4. If you change your mobile phone and there is still no service, it may be a problem with the SIM card. You can go to the business hall and test it with accessories.