I'm not sure if the cap is in effect for places with fiber internet (like Verizon FIOS). It wouldn't surprise me, since they've admitted caps are unnecessary.[1]
[0] Charter + Time Warner Cable (after merge) is larger, I think.
[1] https://consumerist.com/2015/11/06/leaked-comcast-doc-admits...
About the time Chairman Wheeler was aiming for net neutrality, he was also looking at data caps and if they were bad. Within a month, Comcast increased theirs to 1 TB. Coincidence?
There's going to be a lot about how 'competitive' ISPs are in the next few years in America now that everything's Republican. But most people have two options: expensive cable ISP that's fast when it wants to be, and slow DSL that's also expensive and not getting better.