Edit: T-Mobile "unlimited" is bullshit. It is only unlimited for the phone itself. Hotspot usage is rate limited to an unusably slow rate after data allowances is used (the limited rate is usually well below the 128kbps they claim, but even when it is reaching 128bps, that's unusable for the modern web, and the latency is horrific, so even shell sessions are impossible once you hit the cap). The only reason I stick with T-Mobile is BingeOn lets me watch Netflix without using much data; though the crappy speed of it makes it unworkable in a lot of locations. But, don't believe their marketing about "unlimited" data. It is not. T-Mobile also seems to measure bandwidth usage in a shady way; I use about 1GB a day on Karma...same kind of usage results in 2GB+ a day on T-Mobile. I haven't analyzed what's really going on with any precision, but I've noticed the discrepancy on a few occasions; it has happened often enough and to a large enough degree to where I think the smoke is indicative of a fire.