[February 22, 2018]

T-Mobile US Expands Board of Directors and Names COO Mike Sievert to Board

T-Mobile (News - Alert) US (NASDAQ: TMUS) has named Mike Sievert, Chief Operating Officer, to its Board of Directors. Sievert joined T-Mobile as Executive Vice President and Chief Marketing Officer in 2012 before moving to his current role as Chief Operating Officer in 2015. As COO, Sievert leads T-Mobile's customer-facing operations across the business, including its award-winning customer care team, retail management and sales organization, marketing, product management, business planning, T-Mobile For Business and Layer3 TV.

"Mike's been instrumental to the Un-carrier's success, and I know he'll be a great addition to our Board of Directors," said John Legere, CEO and president of T-Mobile.

Sievert is one of the architects of T-Mobile's Un-carrier movement to change wireless for good. He hs been instrumental in the company's charge to build a nimble business focused on fixing customer pain points, an approach that has been the foundation for T-Mobile's unprecedented growth over the past five years.

Sievert's appointment increases the size of the Board from eleven to twelve directors.

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 (News - Alert) network delivers outstanding wireless experiences to 72.6 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.

View source version on businesswire.com: http://www.businesswire.com/news/home/20180222006518/en/

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