AT&T Data Throttling

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http://forum.xda-developers.com – Is At&t still throttling data for grandfathered unlimited users? I used to get a warning text when I got near 5gb. But for the past two months I have been streaming through the Google Music App and haven't gotten one text message or email. I am currently up to 13gb data usage, my next billing cycle is 5/27, so I may hit 20gb for the month. I remember when I first got my Galaxy S III I streamed for a week straight and got the text message warning. Is this something they are doing for their unlimited lte users, because I was seriously thinking about signing up for T-Mobile's unlimited (HowTos)