Once your account is active, you can sign in using your email or phone number and password.
If you have not yet verified your account [i.e. you have not yet confirmed your email address using the email sent during the SIM activation or account creation process], sign in using your US Mobile phone number. Acceptable formats for entry are as follows: 5158889999 or (515) 888-9999. It’s important that you verify your email address so that US Mobile can contact you regarding personal account information if necessary.
If you have multiple SIM cards registered to the same account, any of those phone numbers will work to sign in.