If you ever wanted to unlock your iPhone 4S while you are rocking to AT&T, then you would be pleased to hear that there is a method of doing so without having to go through the hassle of jailbreaking your device. Yes sir, someone decided to take advantage of an alleged bug in iOS 5, where it supposedly allows you to unlock your best iPhone yet, although you will need to have the tools of the trade to do so beforehand. First off, you are required to be in possession of a T-Mobile Micro SIM as well as your AT&T SIM from your iPhone 4S.
The full instructions can be found here, and so far it has been confirmed by at least one user, although I am quite sure that many others more will follow suit. Bear in mind that this particular method works only for GSM models, and CDMA models might need a different kind of cajoling to get the job done. Of course, it might end up messing your handset as with any kind of unauthorized hacks or cracks, but at least you’ve freed your iPhone 4S.