Alltel Wireless First U.S. Carrier to Launch XM Satellite Radio; Audio Streams of 20 Popular XM Music Channels Available on Alltel Wireless Phones Beginning Today.

LITTLE ROCK, Ark. and WASHINGTON -- Alltel Wireless, America's largest network, today announced an agreement with XM Satellite Radio that will make Alltel customers the first in the United States to have access to a wide range of XM Satellite Radio programming via their wireless phones. Alltel Wireless customers can gain unlimited access to select XM radio channels from the XM Radio Mobile service for $7.99 per month. The application was developed by MobiTV, the global leader in television and digital radio services for cellular, Wi-Fi and broadband enabled devices.

Alltel Wireless customers will receive audio streams of 20 popular commercial-free XM music channels including: The 70s, 80s and 90s decades channels, Top 20 on 20 (Top 20 Hits), Ethel (New Alternative Rock), The City (Hip-Hop/R&B Hits), XMU (Indie Rock), Bluesville (Blues), Highway 16 (New Country Hits), and Viva (Latin Pop Hits).

Customers will be able to select these channels by genre. XM will deliver data to make it possible to view the song title, artist and album while listening on a variety of compatible handsets.

"As consumers continue to turn their wireless phones into mobile entertainment hubs, Alltel Wireless continues to explore partnerships to build on our extensive portfolio of content," said Frank O'Mara, executive vice president of sales and marketing for Alltel Wireless. "Having America's largest wireless network partner with America's largest satellite radio provider was a natural fit, and we know our customers will enjoy XM's stellar line-up of programming."

"Consumers are increasingly eager to access great, commercial-free music on their mobile phones," said Adam Reyer, senior vice president of Business Development for XM Satellite Radio. "XM Satellite Radio will launch its new mobile service to Alltel customers, providing them with access to an assortment of XM's acclaimed music programming on their mobile phones virtually anywhere they go."

About XM Satellite Radio

XM (Nasdaq: XMSR) is America's number one satellite radio service with more than 7 million subscribers. Broadcasting live daily from studios in Washington, DC, New York City, the Country Music Hall of Fame in Nashville, Toronto and Montreal, XM's 2006 lineup includes more than 170 digital channels of choice from coast to coast: the most commercial-free music channels, sports, talk, comedy, children's and entertainment programming; and the most advanced traffic and weather information. XM Radio Mobile's current lineup consists of 20 commercial-free music channels.

XM, the leader in satellite-delivered entertainment and data services for the automobile market through partnerships with General Motors, Honda, Toyota, Hyundai, Nissan, Subaru, Suzuki and Porsche, is available in more than 140 different vehicle models for 2006. XM's industry-leading products are available at consumer electronics retailers nationwide. For more information about XM hardware, programming and partnerships, please visit http://www.xmradio.com.

About Alltel Wireless

Alltel (NYSE: AT) is owner and operator of the nation's largest wireless network and has more than 11 million wireless customers. For more information about Alltel, please visit http://www.alltel.com.

Factors that could cause actual results to differ materially from those in the forward-looking statements in this press release include demand for XM Satellite Radio's service, the Company's dependence on technology and third party vendors, its potential need for additional financing, as well as other risks described in XM Satellite Radio Holdings Inc.'s Form 10-K filed with the Securities and Exchange Commission on 3-9-06. Copies of the filing are available upon request from XM Radio's Investor Relations Department.