T-Mobile Receives Highest Marks for Wireless Call Quality, According to J.D. Power and Associates Study; In Regions Covering 28 of the 48 Contiguous States, T-Mobile USA Receives Highest Rankings for Call Quality

Business Wire, March 16, 2006

BELLEVUE, Wash. -- T-Mobile USA, Inc. executed in 2005 the largest network build-out in its history, reflecting the company's continued focus and commitment to improving network coverage and quality. Now, there are significant signs that T-Mobile customers are reaping the benefits of an even stronger T-Mobile wireless network.

According to the J.D. Power and Associates 2006 Wireless Call Quality Performance Study(SM) -- Volume 1 released today, T-Mobile overall ranked highest among wireless carriers for call quality in three of the six regions surveyed: West and Southwest outright; and Northeast in a tie.

T-Mobile was highest, or tied for highest, in providing the highest wireless call quality in regions covering 28 of the 48 contiguous states.

"These strong call-quality results for T-Mobile are a further demonstration that our continued focus on enhancing the customer experience is paying off," said Neville Ray, senior vice president for Engineering & Operations, T-Mobile USA. "Network coverage and quality have been significantly enhanced where our customers live, work and play, and this study is the latest affirmation of our progress."

The study provides a detailed report card based on consumers' experiences using a diary approach -- recording the most recent information pertaining to any issue they may have experienced with their wireless service

T-Mobile's showing was particularly strong versus the regional average in several specific areas:

--In the West, T-Mobile was significantly stronger when it came to attaining a connection on the first try and yielding the fewest number of dropped calls.

--In the North Central, T-Mobile rated significantly better in the number of dropped calls and in the amount of echo on the line.

--In the Southwest, T-Mobile was considerably stronger in achieving a connection on the first try and in encountering the least amount of static.

The study also noted that, nationally, T-Mobile rated significantly better than the industry average in initial connections -- calls connected on the first try.

Previously this year, J.D. Power and Associates announced that T-Mobile ranked highest in wireless customer service performance -- for the third consecutive time -- among national wireless service providers in the 2006 Wireless Customer Care Performance Study(SM).

About T-Mobile USA Inc.

Based in Bellevue, Wash., T-Mobile USA, Inc. is a member of the T-Mobile International group, the mobile telecommunications subsidiary of Deutsche Telekom AG (NYSE:DT). T-Mobile USA's GSM/GPRS voice and data networks in the United States (including roaming and other agreements) reach more than 268 million people. In addition, T-Mobile operates the largest carrier-grade, commercial wireless broadband network in the United States, providing Wi-Fi access at more than 7,400 public locations throughout the country, with further Wi-Fi access being made available at over 27,000 international roaming locations. Through its Get More(R) promise, T-Mobile provides customers with more minutes, more features and more service. For more information, visit the company Web site at www.t-mobile.com. T-Mobile(R) and Get More(R) are federally registered trademarks of Deutsche Telekom AG and T-Mobile USA Inc., respectively.

Note to Editors:

The J.D. Power and Associates 2006 Wireless Call Quality Performance Study(SM) provided results for the following regions:

West: Arizona, California, Colorado, Idaho, Iowa, Minnesota, Montana, Nebraska, Nevada, New Mexico, North Dakota, Oregon, South Dakota, Utah, Washington, Wyoming

Southwest: Arkansas, Kansas, Missouri, Oklahoma, Texas

North Central: Illinois, Indiana, Michigan, Ohio, Wisconsin

Northeast: Connecticut, Maine, Massachusetts, New Hampshire, New York, Rhode Island, Vermont

Mid Atlantic: Delaware, District of Columbia, Maryland, New Jersey, Pennsylvania, Virginia, West Virginia

Southeast: Alabama, Florida, Georgia, Kentucky, Louisiana, Mississippi, North Carolina, South Carolina, Tennessee