So this is actually something REALLY awesome for existing AT&T long term customers with a 10GB plan. Call and speak to their "disconnect/retention" department and mention that you heard of a double your data promotion for good customers that have had AT&T a for a while. It seems to be the matching of a similar Sprint promotion I've heard. Anyway, it's really a great thing and the reps are very helpful and you don't have to "fight for it". I was thinking of switching to T-Mobile and did their test drive, but the service with T-Mobile was bad in my house with no data (not even edge) right nearby, so even though AT&T is a lot more expensive, this doubled data does help and will probably lead me to sticking with them.