check whether the personal information is correct and whether the signal and network are unblocked.

There are many factors that account cannot be logged in: 1. Check whether the entered user name, login password and verification code are correct.

2. Whether to log in with simple service password, initial password, etc. You can log in after modifying the password.

3. If the cell phone signal is weak or there is no signal, you can't log in normally. You can try again at another location.

4. Whether the number is in arrears, shutdown, etc. will make it impossible to log in, so you can pay for it before turning it on.