Here's Why T-Mobile US Inc Isn't Carrying the New Windows Phones By Scalper1 | October 16, 2015 0 Comment Scalper1 News While Microsoft says it’s not an exclusive relationship, the new flagship Windows 10 phone, the Lumia 950, will launch only with AT&T . It’s a peculiar deal where the phone’s maker has said it’s Scalper1 News Scalper1 News Related posts: Why Cheap Windows Phones May Finally Find Success 3 Things Microsoft Wants You to Know About Windows 10 for Phones Lumia 920 Leads Windows Phone Market – Analyst Blog What Microsoft's Windows 10 Means for Mobile Healthcare