In other words, as long as the iPhone you want to unlock is gathering dust in a drawer somewhere, AT&T will probably unlock it. If you or your business bought an iPhone 4S once it became available in October, you can't unlock it. It's probably still under contract. Upon purchasing our ATT iPhone unlock service, http://www.att-iphone-unlock.com/ you will be able to unlock 1 (one) AT&T iPhone 2G, 3G, 3Gs, 4, 4S, 5 or the new iPhone 5C or 5S. If this method fails to unlock your AT&T GSM iPhone 4S, then follow the instructions to unlock your GSM iPhone 4S with an original carrier SIM card.