The only way to get an iPhone on T-Mobile the past few years was to go out and buy an unlocked iPhone and put a T-Mobile SIM card in it. Now that T-Mobile has become an official carrier, a lot of iPhone users that are already on the carrier want to be able to use LTE but can’t.
To make things better, T-Mobile says they’re going to rollout an update for all unlocked iPhones on the network starting April 5th. The update will flip the switch on features that aren’t currently available, like LTE and Visual Voicemail.