MCI Secures Danger, Inc. As New Hosting Customer

MCI Hosts Next-Generation Wireless Data for Danger's hiptop® Mobile Internet Platform

ASHBURN, Va., June 28, 2005-MCI, Inc. (NASDAQ: MCIP) today announced a four-year agreement with Danger, Inc., provider of the hiptop® mobile Internet platform, the software and services that power the popular T-Mobile Sidekick handheld device. MCI will provide a hosting environment to meet the growing demand for sophisticated mobile Internet and data services offered by Danger to wireless operators.

With MCI's Premium Data Center Services, Danger can focus on further development of compelling wireless data applications and services for the mobile Internet. As more wireless operators adopt Danger's mobile Internet platform, MCI Data Center Services offer the performance, security, and scalability for hosted data services that Danger requires to meet the growing demand for wireless instant messaging, email and Internet access.

"Danger can rely on MCI Hosting Services to keep their next-generation wireless operations running smoothly day-in and day-out," said Steve Young, senior vice president of MCI Commercial Markets. "As more wireless operators rely on these new 'must-have' IP-based services, MCI Hosting is playing an increasingly important role supporting Danger's operations so they can focus on serving their customers."

Due to its rigorous operational requirements, Danger reviewed a number of different hosting providers at the direction and counsel of LinkSource Communications LLC, a California-based telecom services and consulting firm. Danger determined that the capabilities of MCI's Data Center Services met the critical networking and infrastructure objectives for Danger as its business grows through partnerships with other wireless operators nationally and abroad.

"We selected MCI for its distinguished reputation for Data Center Services that deliver unparalleled global reach, scalability, security and reliability," said Arnold Magacle, Danger's senior network operations manager. "We are confident that MCI's state-of-the-art hosting facilities will meet our rapidly expanding networking requirements today and into tomorrow."

MCI Hosting Services
As a leader delivering advanced hosting services, MCI offers a complete continuum of innovative managed hosting and Data Center Services. MCI's Enterprise Hosting, a Digex Service, and its hosting operations team holds more than 450 individual and organizational professional certifications from leading technology companies, including Microsoft, HP and Sun Microsystems. MCI Hosting is also positioned in the Leaders Quadrant in Gartner Inc.'s Web Hosting Magic Quadrant*. According to Gartner, Inc., leaders are vendors who are performing well today, have a clear vision of market direction and are actively building competencies to sustain their leadership position in the market.

About MCI, Inc.

MCI, Inc. (NASDAQ: MCIP) is a leading global communications provider, delivering innovative, cost-effective, advanced communications connectivity to businesses, governments and consumers. With one of the most expansive global IP backbones and wholly-owned data networks, MCI develops the converged communications products and services that are the foundation for commerce and communications in today's market. For more information, go to www.mci.com.

About Danger, Inc.
Danger provides a complete solution that enables wireless carriers to offer innovative and affordable voice and data products to consumers over next-generation wireless networks. Today, this solution includes: the hiptop Service Delivery Engine - a back-end service delivery infrastructure; the hiptop Development Platform-a platform for the development of mobile internet applications using industry standard development tools; and the hiptop Device Design-a hardware design for a wireless all-in-one device that may be customized and branded by wireless operators. Founded in January 2000, Danger is a privately held company backed by leading venture capital firms and corporate investors. Danger is based in Palo Alto, Calif. Additional information about the company is available at www.danger.com.

About LinkSource Communications, LLC
LinkSource Communications, LLC is a privately held telecom services and consulting firm with offices in Sacramento, Ca., San Ramon Ca, Phoenix, Az and Philadelphia, Pa. They specialize in supporting customer's requirements for IP Telephony and MPLS networks in addition to managing all other aspects of medium and large customers' telecom services, while maximizing their global and national relationships to best suit the clients need. For more information, go to www.linksourcecom.com.

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*The Magic Quadrant is copyrighted October, 2004 by Gartner, Inc. and is reused with permission. The Magic Quadrant is a graphical representation of a marketplace at and for a specific time period. It depicts Gartner's analysis of how certain vendors measure against criteria for that marketplace, as defined by Gartner. Gartner does not endorse any vendor, product or service depicted in the Magic Quadrant, and does not advise technology users to select only those vendors placed in the "Leaders" quadrant. The Magic Quadrant is intended solely as a research tool, and is not meant to be a specific guide to action. Gartner disclaims all warranties, express or implied, with respect to this research, including any warranties of merchantability or fitness for a particular purpose.