A Windows Phone 7 handset on T-Mobile is the stuff of last year's news. Add a dash of AWS bands to that Redmond-made OS, however, and you've got our tongues wagging in anticipation. Thanks to a pair of leaked shots over on TmoNews, we have some sticker-based confirmation that WP7 and HSPA+ are soon to be bosom buddies. As the pic above clearly shows, there's a conspicuous difference between the magenta-splashed 4G sheet on the left and its vanilla Windows Phone iteration. While we're not exactly sure which device will get the 4G honors, we can safely assume it'll be Mango-flavored when it hits.