Japan's Leading Wireless Operator KDDI to Launch International Roaming Based on Syniverse Technologies UniRoam(SM) Solution.

TAMPA, Fla. -- Syniverse Technologies (NYSE:SVR), a leading provider of mission-critical technology services to wireless telecommunications companies worldwide, and KDDI, Japan's leading fixed line and mobile phone service provider, today announced the launch of interstandard, international roaming service between KDDI's CDMA network and GSM networks, enabled by Syniverse's UniRoam service.

UniRoam is a technology solution developed by Syniverse that enables seamless roaming between CDMA and GSM networks, which are technically incompatible. UniRoam service eliminates the need to subscribe to a second wireless service through a GSM carrier while traveling where CDMA service is unavailable. The solution allows a subscriber to use their existing wireless phone number to make and receive calls while roaming and have those calls appear on their regular monthly bill.

Syniverse provides the necessary signaling conversion and translation, number mapping between CDMA and GSM networks, as well as billing data conversion, web tools for customer provisioning and troubleshooting, and 24x7 customer support, while leaving the roaming business arrangements to the CDMA operator and a GSM sponsor operator of its choosing.

"With the launch of UniRoam service, KDDI continues to lead the Japanese market in roaming capabilities for subscribers," said Kazuhiko Masuda, KDDI general manager - cellular global business development and planning. "This pioneering technology breaks the limitations of roaming between GSM and CDMA markets. We are especially pleased to offer our subscribers the ability to roam seamlessly from Japan to Europe and other GSM countries."

"Syniverse already provides KDDI with a full suite of CDMA roaming services, so it was a natural extension of our relationship to deliver this highly valued interstandard roaming service," said Dennis Ng, Syniverse vice president - Asia Pacific. "By deploying our UniRoam service, KDDI will be offering business subscribers a valuable productivity tool and leisure travelers will appreciate the convenience of making and receiving calls using their existing phone numbers."

About Syniverse

Syniverse is a leading provider of mission-critical technology services to wireless telecommunications companies worldwide. Syniverse solutions simplify technology complexities by integrating disparate carriers' systems and networks in order to provide seamless global voice and data communications to wireless subscribers. Carriers depend on Syniverse's integrated suite of services to solve their most complex technology challenges and to facilitate the rapid deployment of next generation wireless services. Syniverse provides services to over 300 telecommunications carriers in approximately 40 countries, including the ten largest U.S. wireless carriers and six of the ten largest international wireless carriers. Headquartered in Tampa, Fla., U.S.A., Syniverse has offices in major cities throughout North America, The Netherlands and the United Kingdom and a global sales force in the United Kingdom, Luxembourg, Italy, China, Hong Kong, Brazil, Slovakia and India. For more information, visit http://www.syniverse.com

About KDDI

KDDI is a diversified telecommunication operator formed by the merger of DDI, KDD and IDO in 2000, and is the only domestic company that provides both mobile communication service and broadband service. The 69 KDDI group companies had approximately 12,000 staffs and sales in FY2005/3 were 2,920.0 billion yen. In the next-generation mobile communications area, KDDI successfully launched CDMA2000 1x on April 1, 2002 and then CDMA2000 1x EV-DO on November 28, 2003. The total number of subscribers of its cellular service topped the twenty million mark on June 7, 2005, including more than four million EV-DO subscribers. KDDI started Japan's first international roaming service on April 21, 2000, and its current CDMA roaming coverage includes 16 countries/areas.

Cautions about Forward-Looking Statements

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These include, but are not limited to, statements regarding the Company's plans, intentions and expectations. Such statements are inherently subject to a variety of risks and uncertainties that could cause actual results to differ materially from those projected. Given these concerns, investors and analysts should not place undue reliance on forward-looking statements.