News T-Mobile USA Ranks Highest in Southwest for Wireless Call Quality

T-Mobile’s Call Quality in the Southwest United States Given Top Marks by J.D. Power and Associates

Dallas, Texas — Sep. 9, 2010

As T-Mobile USA, Inc. continues the aggressive expansion of its wireless network, J.D. Power and Associates’ latest study shows that customers in the Southwest are reaping the benefits with the highest call quality in the region.

According to the J.D. Power and Associates 2010 Wireless Call Quality Performance StudySM – Volume 2 released today, T-Mobile has earned the sole highest ranking in the Southwest Region and was tied for the highest ranking in the Southeast Region of the United States.

“We’re happy about the recognition, but we’re most excited for our customers,“ said Bentley Alexander, vice president, south region engineering, T-Mobile USA. “When our customers in the Southwest connect with their families and loved ones, they know they can depend on the greatest call quality in the region, providing clear communication and rich mobile experiences.“

The study from J.D. Power and Associates provides a detailed report card of consumers’ experiences with major U.S. wireless carriers, based on several factors related to call quality. In the Southwest Region, consisting of Arkansas, Missouri, Kansas, Oklahoma and Texas, T-Mobile rated significantly better than the regional average in terms of calls with static, echoes or distortion, and at parity or better than the regional average on dropped calls and calls not connected on the first attempt.

Results of the 2010 J.D. Power and Associates Wireless Call Quality Performance StudySM – Volume 2 are based on more than 26,000 Internet survey interviews conducted between January 2010 and June 2010. Survey respondents were asked about their experience with static and interference, dropped and disconnected calls, voice distortion, calls not connected on the first attempt, echoes, voice message notification delay or failure, and text message notification delay or failure.

This summer has featured recognition for T-Mobile in several J.D. Power and Associates studies. In July, T-Mobile received the highest ranking in the J.D. Power and Associates 2010 Wireless Customer Care Performance StudySM – Volume 2, demonstrating the company’s commitment to delivering superior customer service online and over the phone, as well as in retail stores. In August, T-Mobile was given the highest ranking in the J.D. Power and Associates 2010 Wireless Retail Sales Satisfaction StudySM – Volume 2, the third consecutive highest ranking in that study.

More information about J.D. Power and Associates studies can be found at http://www.jdpower.com.

Alexandra Trask

T-Mobile USA Media Relations

425-378-4002

mediarelations@t-mobile.com