Xiaomi's mobile phone shows service, but it can't surf the Internet, make phone calls or send text messages.

Xiaomi's mobile phone displays services, but can't surf the Internet, make phone calls, send text messages, etc. The reason for this is the following：

1) The mobile phone is in arrears. Please check whether the phone bill balance is in arrears.

2)Sim card problem, I suggest you don't have multiple cards or try to plug your multiple cards into other mobile phones.

3) Mobile phone system operation error. It is recommended to turn it off before turning it on, if not. Only factory settings are restored. If the factory settings are restored, it still won't work. Only for repair.