T-Mobile US, Inc. (NYSE: TMUS) will host a 90-minute earnings call and an extended, open conversation live from San Francisco to discuss the company’s first quarter 2015 financial and operational results on Tuesday, April 28, 2015 from 10:00 a.m. to 11:30 a.m. Eastern Daylight Time (EDT). Similar to past quarters, scripted remarks will be kept to a minimum in order to provide more time for free-flowing dialogue with analysts, investors, media and consumers.

Participants will have multiple ways to submit questions including via phone and Twitter (@TMobileIR using #TMUSearnings). T-Mobile will also take questions via text and respond to some of them on the call (send a text message to 313131, enter the keyword TMUS followed by a space).

Our Twitter feed will have live-streamed video that can be accessed via a mobile device or desktop computer.

T-Mobile US, Inc. will issue a press release and Investor Factbook reporting its results at approximately 7:30 a.m. EDT on Tuesday, April 28, 2015. The press release and Investor Factbook will be posted at the same time on the Investor Relations website at http://investor.t-mobile.com.

Q1 2015 Earnings Call, Livestream and Webcast Access Information

Access via Phone (audio only):

Date:       Tuesday, April 28, 2015
Time: 10:00 a.m. (EDT)
Call-in Numbers: 800-432-9830
International: 719-234-7318
Participant Passcode: 8308615

Please plan on accessing the earnings call ten minutes prior to the scheduled start time.

Access via Social Media:

Embedded livestream on Twitter handle: @TMobileIR

Submit Questions via Text or Twitter:

Text:       Send a text message to 313131, enter the keyword TMUS followed by a space
Twitter: Send a tweet to @TMobileIR using #TMUSearnings

Access via Webcast:

The earnings call will be broadcast live via the Company's Investor Relations website at http://investor.t-mobile.com. A replay of the earnings call will be available for two weeks starting shortly after the call concludes and can be accessed by dialing 888-203-1112 (toll free) or 719-457-0820 (international). The passcode required to listen to the replay is 8308615.

To automatically receive T-Mobile financial news by e-mail, please visit the T-Mobile Investor Relations website, http://investor.t-mobile.com, and subscribe to E-mail Alerts.

T-Mobile Social Media

Investors and others should note that we announce material financial and operational information to our investors using our investor relations website, press releases, SEC filings and public conference calls and webcasts. The company also intends to use @TMobileIR and @JohnLegere, which Mr. Legere uses as a means for personal communications and observations, as means of disclosing information about the company and its services and for complying with its disclosure obligations under Regulation FD. The information we post through these social media channels may be deemed material. Accordingly, investors should monitor these social media channels in addition to following the company’s press releases, SEC filings and public conference calls and webcasts. The social media channels that the Company intends to use as a means of disclosing the information described above may be updated from time to time as listed on the company’s investor relations website.

About T-Mobile US, Inc.

As America's Un-carrier, T-Mobile US, Inc. (NYSE: TMUS) is redefining the way consumers and businesses buy wireless services through leading product and service innovation. The Company's advanced nationwide 4G LTE network delivers outstanding wireless experiences to more than 55 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.