A software update released on Friday will give iPhone 5 users on T-Mobile access to the carrier's LTE network, in addition to adding a number of other features like Visual Voicemail
T-Mobile on Friday updated its support forums (via TmoNews) to detail the new features the carrier update will bring. All eligible iPhones using a T-Mobile SIM card will now have access to Visual Voicemail, the Commercial Mobile Alert System, and LTE connectivity on T-Mobile's AWS spectrum for iPhone 5 users.
The update also brings HD Voice to T-Mobile iPhone 5 users, and it contains device/network optimizations that will improve battery life.
The update is restricted to iPhones running iOS 6.1.x or higher. Rumors of the update leaked earlier this week, and it has rolled out as predicted.