we may call them ( cutyoursim.) Providence team perhaps for At&t all iPhone include 4s .
according to their blog post 29/02/2012 they started AT&T iPhone Factory Unlock Service .
according to their blog This service is 100% tested but it's still in Beta stage
cutyoursim blog : We are very happy to announce that we just started a new service to unlock all iPhones from AT&T USAincluding the latest 4S.
This service is 100% tested by us and working but since we have only been able to test it for a short period of time we will still call it a beta service.Soure is here
Price for this service will be 199.99USD. Turnaround will be set to 1-20 days due to the high demand of this service.
