Databack has a min blowing concept of giving data in form of recharge as users of databack loose nothing.
But the work thing about this app is it opens every day in the morning or it opens automatically after you have nit used yiur phone. And this feature hangs my device completely for about 1 to 3 minutes. Sometimes I get fed up and leave it as pressing home button also does nothing.
You get data about 300 mb per month and yiu can recharge according to the plans they provide.
The app is not usefull to me as the plans provided are of less validy as well as you cannot simultaneously recharge. There need to be 20 days gap betwen recharges.