When T-Mobile launches the iPhone 5 next month, the device will be a little different than existing handsets, with support for AWS bands so it’s compatible with the carrier’s brand new LTE network. That means if you currently have an AT&T iPhone 5 and want to hope over to T-Mobile’s new UNcarrier plans, you wouldn’t be able to take advantage of the fresh LTE speeds. Unless you jailbreak your device.
Some very crafty individuals have figure out how to modify current handsets to play nice with T-Mobile’s LTE network; anyone with an unlocked and jailbroken model from AT&T (Verizon won’t work) simply needs to install a small tweak through Cydia to enable the correct LTE band.
Unfortunately, if you decide you absolutely want to use T-Mobile’s LTE network, you won’t be able to connect to the carrier’s excellent HSPA+ network. One of the advantages of T-Mobile’s iPhone 5 is that it falls back to HSPA+ where LTE isn’t available (which is plenty of spots around the U.S.). It’s not like purchasing a device specifically for T-Mobile, but the option is there if you don’t mind jailbreaking and doing a bit of leg work.
For a full rundown on getting the tweak up and running, LEI Mobile has provided a thorough how-to.