This app was mentioned in 1 comment, with an average of 3.00 upvotes
From the AT&T Website:
> You can earn extra data, measured in megabytes (MB), by:
> * Taking surveys > * Shopping and more!
> Your data is stored within the app and is easily transferred to your AT&T account for use within your current bill period.
> Transferred data (maximum 1,000MB per bill period) is only for use by the individual smartphone line registered with the app and expires within the same bill period it is transferred.
Interesting approach...