Today AT&T launched a new limited-time offer to new and existing subscribers featuring double data on Mobile Share Value plans 15 GB and up. The offer is good through October 31st, at which point the data buckets will revert to their regular sizes. Subscribers who sign up for the a new line on these plans before October 31st will be able to keep their double data for as long as they want it, even after the offer has expired.

At the new prices, a 30 GB shared data bucket will cost $130 per month, where the same amount of data would normally run for $225, coming out to a total savings of $95 per moth. While the usual offers only go up to 50 GB, there are now three larger buckets at 60, 80, or 100 GB, with most costing only a fraction of the price of the regular $50.

The move is likely being made to compete with carriers like Sprint, which recently doubled its data offering for all subscribers. T-Mobile has also continued driving the rest of the nation’s carriers to change their pricing and plans with its “un-carrier” movement.