The mobile carrier made profits from services not ordered by customers, the FTC said.
The latest moves in T-Mobile's Uncarrier campaign include letting would-be customers test drive an iPhone 5s for a week and allowing subscribers to stream music from more than half-a-dozen services without it counting against their data plan.
Like Amazon, T-Mobile will hold a press event in Seattle Wednesday night. But it seems unlikely that T-Mobile's event has anything to do with Amazon's rumored smartphone.
T-Mobile representatives confirmed issues with the company's network, but not the scope or duration.
Today T-Mobile announced its third-quarter sales results, which significantly exceeded analysts' estimates.
Sprint would have to pay more than $1 billion if its plan was rejected, The Wall Street Journal reported.
Details of an agreement to merge T-Mobile with SoftBank's Sprint aren't yet available.
The update fixes a bug that wouldn't allow GS5 owners to receive SMS or MMS messages.
Carrying voice calls over LTE means faster call setup, the carrier said. And it beats AT&T's own announcement, too.