Re: why is att go phone online asking for last 4 of social security number.
For Gophone, the Social security number is not needed. I'm pretty sure you were asked to put your phone number and your 4-digit pin.
Go to www.paygonline.com and put your phone number, if you dont know your pin, click on Forgot your password. You will be sent the pin to your cellphone via text message, so you need to have your cellphone with you in doing this.