Get the iPhone 4S to Work on T-Mobile Without Hacking
In the US, the iPhone 4S comes on AT&T, Sprint, and Verizon, but one major carrier is noticeably absent: T-Mobile. But a method has surfaced to unlock the iPhone 4S that allows it to be used on the T-Mobile network. A video showing the process has been posted to YouTube, though it won't tell you how to do it. While it has not been completely confirmed, several users have reported success with the process.