BELLEVUE, Wash.--(BUSINESS WIRE)--T-Mobile (NYSE: TMUS) today announced its next industry-rocking Un-carrier™ move − eliminating the infuriating wireless industry practice of confiscating unused data you’ve already paid for. With Un-carrier 8.0, high-speed data you don’t use each month automatically rolls into a personal Data Stash™ so you can use it when you need it for up to a year. And, the best part is that Data Stash is included at no extra charge for every single new and existing T-Mobile