Unofficial T-Mobile Blog, News, Videos, Articles and more. 7 Mar 2020 Editor's note: We will be updating this list of the best T-Mobile deals regularly as new promotions go live. 1. Get 50% off the OnePlus 7T. OnePlus 5 Jan 2020 T-Mobile often runs all sorts of deals and promotions at any given time, and these are the absolute best ones that you should keep your eye on.