Over the course of the last few weeks, we've heard a lot about unlimited data plans. Verizon announced a new unlimited plan which kicked off changes T-Mobile and Sprint's long-standing unlimited plans. After a failed first attempt to get its unlimited data plan right, AT&T later announced a more competitive (yet still more expensive) unlimited data plan of its own.
T-Mobile's increase isn't a response to increased competition, as already offered the highest data allotment among the four carriers. Instead, the company adjusts the threshold every quarter based on network performance and usage.