Hello, when you change your mobile phone or desktop to log in, you need to receive the verification code by the register mobile number before you can log in.

[Tips]:
1. If the password is forgotten, you can use the SMS verification code to reset the password and then modify it. If the old number cannot be used, it is recommended to abandon the account;
2. If the mobile phone is lost, you need to log in to the new device to change the mobile phone number. If you log in to the new device, you will need the SMS verification code. If the old mobile phone number cannot be used, you cannot log in and successfully modify the mobile phone number. It is recommended to abandon the account and re-create it, and sign up with your new phone.