Its easy. You just need to call customer service sa AT&T
You can use SKYPE making FREE TOLL FREE NUMBER CALLS
Call customer service and "THEY WILL" unlock it for you
provided
It is not tagged as LOST or STOLEN
It is no longer in CONTRACT by previous owner
If Contract was cancelled, Early Termination Fee PAID
What you need?
IMEI
Email address
just tell them you bought the phone in EBAY. no further questions will be asked LOL
expect the unlock code in 5~7business days