T-Mobileís support for unlocked iPhones has now been officially detailed, reports tmonews. Although the carrier does not sell new iPhones to customers, it has been keen to cash in on iPhone users with unlocked devices, or who off contract with their original carrier. From September 12, T-Mobile retail staff will be give in-house training on how to set up iPhones for customers wanting to take up one of its Unlimited Plans for unlocked iPhones.