Starting today, Tuesday June 14th, 2011, Apple decided to sell the iPhone 4 fully unlocked. This is not the first time Apple does that. Apple store have been selling unlocked iPhones in many international countries like Hong Kong and Canada. Now, for the first time, Apple will sell the iPhone 4 (16Gb and 32 GB) completely unlocked, so you will use it with any GSM carrier in the USA or out.
With just a few months between the start of the summer and the expected launch of Apple’s fifth-generation iPhone, the availability of unlocked devices will allow also users to purchase iPhones now and then make a subsidized purchase in September, or whenever Apple finally does release the iPhone 5.
T-Mobile users .. this is your chance to own and iPhone without any problems of paying to get it unlocked and having issues when you update the software. However, this iPhone 4 will no support yet AWS 3G band. Maybe you should wait until September and get the iPhone 5.