T-Mobile’s big press conference isn’t until 3:30 p.m. EST, 12:30 p.m. PST on Wednesday, but it looks like the cat is already out of the bag: Uncarrier 4.0 will be yet another big push to get subscribers to make the switch from rival carriers. But this time, T-Mobile wants people to make the switch right now. AT&T’s preemptive strike â offering customers up to $450 per line to switch from T-Mobile â was right on the money; with its latest move, T-Mobile will pay a family’s early termination fees when they break another carrier’s contract, switch to T-Mobile and trade in their current devices. The news was revealed in a banner published early on T-Mobile’s website that was discovered by Droid Life. Additional details are unknown for the time being, though the blog says that T-Mobile will pay up to $350 per line when customers bring over at least three lines.