[Skip to content](https://www.t-mobile.com/news/press/federal-court-rules-that-att-was-infringing-on-t-mobiles-magenta#maincontent) [Newsroom](https://www.t-mobile.com/news)Toggle secondary navigation - [Network](https://www.t-mobile.com/news/category/network) - [Devices](https://www.t-mobile.com/news/category/devices) - [Un-carrier](https://www.t-mobile.com/news/category/un-carrier) - [Community](https://www.t-mobile.com/news/category/community) - [Offers](https://www.t-mobile.com/news/category/offers) - [Business](https://www.t-mobile.com/news/category/business) English [Press Release](https://www.t-mobile.com/news/press) # Federal Court Rules that AT&T was Infringing on T‑Mobile’s Magenta Trademark Color and Orders an Injunction February 07, 2014  1 min read - Facebook IconShare on Facebook - Share on Twitter - LinkedIn IconShare on LinkedIn A federal court has halted AT&T's transparent effort to infringe on T-Mobile's distinctive magenta trademark. T-Mobile \[U.S. Inc.] is very pleased that the federal court in Texas has ordered Aio Wireless, a subsidiary of AT&T, to stop infringing T-Mobile's magenta trademark. The court agreed with us that Aio can't continue infringing T-Mobile's magenta mark by using large blocks of what it has called "plum," and told Aio to stop using magenta or similar colors in all of its marketing and advertising, including stores, web sites and social media. The Court's ruling, coming after extensive argument and a three-day hearing, validates T-Mobile's position that wireless customers identify T-Mobile with magenta and that T-Mobile's use of magenta is protected by trademark law. The complete ruling is available on the court's docket, *T-Mobile US, Inc. v. Aio Wireless LLC, Case No. H-13-2478 (S.D. TX).* *HUG#1760274* ## Related Stories [More Stories](https://www.t-mobile.com/news/stories) [ \ Un-carrierStory \ __T-Mobile Tuesdays Turns 10: Celebrating the Weekly Perks Millions Love__ \ June 02, 2026|12 min read](https://www.t-mobile.com/news/un-carrier/t-mobile-tuesdays-turns-10-celebrating-the-weekly-perks-millions-love) [ \ OffersPress Release \ __T-Mobile Ushers In a New Era of Membership with Its Biggest Celebration Yet__ \ June 02, 2026|11 min read](https://www.t-mobile.com/news/offers/t-mobile-member-month) [ \ BusinessPress Release \ __T-Mobile Brings America’s Best Network to the USGA__ \ May 28, 2026|6 min read](https://www.t-mobile.com/news/business/t-mobile-americas-best-network-usga) [ \ BusinessPress Release \ __T-Mobile Is Changing How Fans Experience the PGA Championship__ \ May 11, 2026|6 min read](https://www.t-mobile.com/news/business/t-mobile-is-changing-how-fans-experience-2026-pga-championship)