Syntonic Wireless unveiled a new app that promises to take advantage of the “Sponsored Data” program of AT&T, which detracts the data you used on branded content from your monthly data plan, and lets app developers and brands pick up the tab instead. A demo of this “content store” app shows many features — from installing apps, to browsing online stores, and eventually streaming branded videos — with none of these eating into your data limit. This new development suggests a refreshing way of encouraging screen-shoppers and mobile-viewers by reducing the hefty cost of data on the consumers’ end. How well the mobile users would embrace that, however, remains to be seen.