T-Mobile and Sprint's new unlimited plans have some nasty fine print

T-Mobile and Sprint are both making a big splash today with the introduction of some too-good-to-be-true data plans. Both companies' new plans offer unlimited talk, text, and — importantly — data, but both companies' unlimited data come with big asterisks beside them.
That's because their data plans have some significant limitations. T-Mobile's plan, called T-Mobile One, limits all video playback to low-res 480p. Sprint's plan, called Unlimited Freedom, has the same video limitation