Sep 17, 2018 T-Mobile and Crown Castle Expand Strategic Relationship BELLEVUE, Washington and HOUSTON, Texas – September 12, 2018 – T-Mobile (NASDAQ: TMUS) and Crown Castle (NYSE: CCI) today announced they have agreed to expand their long-term, strategic relationship. Under the agreement, Crown Castle will deploy additional small cells within their existing footprint and light up small cells in new markets, helping T-Mobile enhance 4G LTE network capacity and prepare for 5G deployments. “This agreement expands our long-term partnership with Crown Castle,” said Neville Ray, Chief Technology Officer for T-Mobile. “By installing additional small cell locations, our customers will have an improved wireless experience with LTE and as we migrate to 5G.” This agreement will add significant infrastructure to both existing markets as well as new markets. Consumers and businesses will benefit from these small cells by being able to connect and access essential data, technology, and wireless services—during everyday interactions, large concerts and sporting events. “Our expanded agreement with T-Mobile strengthens our longstanding relationship and provides a variety of economic benefits to local governments, businesses, and consumers in new and existing markets,” said Jay Brown, Chief Executive Officer, Crown Castle. “We look forward to continuing to support T-Mobile’s growth by investing in infrastructure assets to meet their network needs for years to come.” About Crown Castle Crown Castle owns, operates and leases more than 40,000 cell towers and approximately 60,000 route miles of fiber supporting small cells and fiber solutions across every major U.S. market. This nationwide portfolio of communications infrastructure connects cities and communities to essential data, technology and wireless service – bringing information, ideas and innovations to the people and businesses that need them. For more information on Crown Castle, please visit www.crowncastle.com. Media Contact Alex.Lyons@bm.com Burson Cohn & Wolfe 212-614-3821 Investor Relations Contact Ben Lowe, VP Corporate Finance Crown Castle International Corp. 713-570-3050 About T-Mobile US, Inc. As America’s Un-carrier, T-Mobile US, Inc. (NASDAQ: TMUS) is redefining the way consumers and businesses buy wireless services through leading product and service innovation. Our advanced nationwide 4G LTE network delivers outstanding wireless experiences to 75.6 million customers who are unwilling to compromise on quality and value. Based in Bellevue, Washington, T-Mobile US provides services through its subsidiaries and operates its flagship brands, T-Mobile and MetroPCS. For more information, please visit http://www.t-mobile.com. Members in the News