Verizon did this a while back with all their cell cards, without a very good notification. They originally were all unlimited and they dropped them down to 5gb. I had to call them to correct the exorbitant charges for going over 5gb. They didn't even grandfather people in and I wouldn't be surprised if AT&T after a while forced everyone to switch to the new plans. It's obvious they didn't expect people to be using so much data, I'm sure it is the video streaming that is killing them, that is what always put me over the top on my Verizon cell card.