My mobile phone is Xiaomi's, how can it show that there is no service?

The mobile phone prompts "No Service", which can be detected in the following ways:

1. Please confirm whether the mobile phone is set to airplane mode;

2. Please confirm whether the mobile phone is in arrears;

3. You can go to a place with a good signal and restart the machine;

4. You can change your card and try it on your mobile phone. If it works normally, it is recommended to go to Unicom business hall for testing. If it doesn't work, it may be caused by the mobile phone system. You can go to the mobile phone repair point to check your mobile phone.