AT&T Doubles Data For Free On Select Mobile Share Plans
The move seems to be catered towards data-heavy families and small businesses, where tethering and downloading are a daily happening. If you pony up for a Mobile Share Value plan with a monthly data bucket between 15GB and 50GB, you'll see that bucket doubled. There's no extra charge, no hidden fees, and no promo period. You really can keep the extra data for as long as you stay on the plan.
The promo is available for both new and existing customers, and if you're interested, you can sign up at att.com/mobilesharevalue, or, for small businesses at att.com/bizmobileshare.