You can choose to receive security codes to your mobile phone.

To activate SMS security codes

1. Click Enable in the  SMS section of Settings → Security → Authentication Methods.

   
   

2. Enter your mobile phone number, and then click Send.

    

   

   
   

3. Enter the security code sent to your phone and click Enable.

   

If you enable SMS codes, your Main account will be assigned  Grade 1 verification status, except when it has already been assigned  Grade 1 or higher.

To deactivate SMS security codes

1. Click Disable in the  SMS section of Settings → Security →  Authentication Methods.

2. Enter the code sent to your phone, and then click Verify.