T-Mobile has a new data deal for tablet owners.

Beginning Sept. 3, customers can add any tablet to a Simple Choice plan for $10 more a month, and get double the amount of data, the self-proclaimed "un-carrier" announced on Tuesday.

So, if you're currently on a Simple Choice smartphone plan with 5GB of data, add a tablet to the plan, and T-Mobile will tack on an additional 5GB of data for a total of 10GB between both devices. That's on top of the 200MB of free monthly data the company offers to all tablet owners.

In comparison, on AT&T, Verizon, and Sprint, you can add a tablet to your account for a $10 monthly access fee, but you won't get any additional data, T-Mobile said.

"The old school carriers make you pay for the privilege of connecting your tablet to their network — just to tap into the same limited pool of data you already bought for your smartphone," John Legere, president and CEO of T-Mobile, said in a statement. "With the Un-carrier, you can now get double the data on a network designed for data for one simple price. It couldn't be simpler or more straightforward."

Meanwhile, T-Mobile on Tuesday also expanded its family plan from a maximum of five lines per account to 10. Now, you can add up to 10 additional lines to your account for $10 per line after the second line. You can also add unlimited 4G LTE data for $30 more per line.

The new initiatives come after T-Mobile just yesterday announced that those on the Simple Starter plan can now quadruple their data limit to a full 2GB for just $5 more per month.

T-Mobile and Sprint have been going back and forth lately with new deals intended to one up each other. That comes after a merger between the two reportedly fell apart, but Legere has not limited his criticism to Sprint. T-Mobile recently urged its customers to "rescue" friends on rival carriers with the promise of unlimited data.

For more, check out After T-Mobile, Where Now for Sprint?