MetroPCS in NYC just throttled my data as well. The first month i had over 100gb. I had just moved to a new apt, and got the plan specifically because it was going to be a while before i could get TW to install, just after the Hurricane in NY. So i torrented my entire month's worth of tv/movies/games/music whatever.
Nothing happened that month. So i didn't even bother installing TW cable. Just kept my phone tethered.
This month, right after i hit 49gb, i got the 2 txts. I'm in the 5% and it's abnormal. Which is by and large a ridiculous thing to say. Someone will *always* be in the top 5%... but 5% of what? 1tb, or 100mb? I'm not surprised i'm in the top 5, but now i'm bugging them to give me some numbers. This is total shit to say 5% and that's that, with an unlimited plan... regardless of how much i've used.
I'd much rather have a fixed limit that i know i can work with, than this BS, because they can always say you're too high, with their own criteria, which is crap.
And don't even get me started on the fact that NYC 4g is caps at 4mbs... maybe. Or the fact that tethering is supposed to be supported, even including a tethering app on the phone... but i still need to change my browser' user agent to go anywhere but google.com. Oh... and god in heaven, the crappy phone selection they have. All in all, it was probably a bad choice to go with MetroPCS over TMobile/Sprint (who also has unlimited 4g).