Sprint today moved to counter a mobile data promotion recently launched by AT&T by debuting its own. Beginning today, subscribers to Sprint's Family Share Pack plans will be able to double their data allotments. Families with the 32, 40, and 80GB plans will receive 60, 40, and 120GB, respectively, for the same monthly fee they're already paying. Customers have to visit Sprint stores or call in to customer support by October 31 to receive the new data packages. Additionally, Sprint is waiving the access charge for handsets, tablets, and mobile broadband devices on 20GB or higher data allowances for customers who switch their number to Sprint. Sprint is offering a similar double-data promotion to its business customers, as well.