a locked phone is a phone sold by a service that can only be used by that service. so, if you bought a locked att phone, it will only work on the att network. it's to prevent people from buying phones and using them on other services.
i don't know how to unlock a phone. but, remember, when you start a new activation, the cose of a new phone is usually very cheep, to aquire customers. it's worth just buying another phone.
Was that the $39.99 or the $49.99 calling plan?
This ain't no swamp meet. I don't care if the people down the street are giving away free sh**.