NEW YORK--(BUSINESS WIRE)--Please replace the caption with the accompanying corrected caption: Photo 3: Caption - T-Mobile executives John Legere, center, Mike Sievert, second from left, and Neville Ray, right, host a media briefing announcing Un-carrier 8.0 Data Stash, Tuesday, Dec 16, 2014, in New York. T-Mobile announced its next Un-carrier move – enabling its customers to roll unused, high-speed data into a personal Data Stash each month automatically. (John Minchillo/AP Images for T-Mobile