T-Mobile has been working diligently to be known as the “un-carrier,” and has launched seven previous initiatives in huge gestures to peel itself away from the competition within the wireless market.

On Tuesday, December 16, T-Mobile’s CEO John Legere sat down with David Pogue of Yahoo! News and talked about the next movement from the Magenta network, Uncarrier 8.0. It’s called “Data Stash,” and as the name implies, it allows T-Mobile subscribers to rollover unused high-speed data usage to the next month. T-Mobile says that the rollover megabytes (or gigabytes, depending) can be stored within the stash for up to one year, but that there’s no limit to how much data can be stored within the stash in that timeframe.

Data Stash will be available for free for Simple Choice subscribers, as long as they’re on a plan with at least 3GB or more of data per month for smartphones, or at least 1GB or more of data per month for tablets. The initiative will begin in January 2015, and to help launch the movement T-Mobile is giving 10GB of data into the stash for free.

What do you think of T-Mobile’s new idea?