"Your rates will never go up," Legere boomed to (mostly employee) applause. "But they might go down."

The only real caveat to the Un-contract proposition is if you're clinging to one of T-Mobile's unlimited data plans. While huge rivals like AT&T and Verizon have treated customers with grandfathered unlimited plans like second-class citizens by throttling speeds after thresholds are hit and barring them from tethering, Legere is enacting a sort of data détente that means he won't change the terms of the game for at least two years. As he puts it, he can't zoom out and see how things will shift over the next ten years, but it's a nice little reprieve for folks clutching onto those plans like their lives (or wallets) depend on it. Between a renewed focus on making business plans less of a headache and these thoughtful nods to us consumers, T-Mobile's coming out swinging in 2015 -- the only question now is how much all this actually moves the needle.