T-Mobile has announced at an official event in New York that it will become the fourth carrier in the US to offer Apple's iPhone 5 along with of AT&T, Verizon and Sprint. This is undoubtedly the first time ever that T-Mobile will be officially carrying the iPhone 5, earlier T-Mobile could only be used on an unlocked iPhone. The uncarrier will also be selling the iPhone 4S and iPhone 4 handsets in select markets only.