PALO ALTO, California, May 20 /PRNewswire/ --

- GSM and CDMA Versions Now Available for Service Providers Worldwide; 
SDK Opened to Mobile Application Developers

Aricent, the world's largest private communications software
company, today announced the worldwide availability of the award-winning
Celltop, a mobile client framework that enables the delivery of
next-generation content, commerce and communication services across GSM and
CDMA networks. Celltop allows mobile service providers to transform the user
experience by providing easy access to data services and applications.

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In addition, the Celltop software development kit (SDK) for
both BREW uiOne and J2ME handset platforms is now available for third party
developers, content providers and aggregators to create future cells for the
Celltop platform.

Following an initial launch on selected Alltel Wireless phones
in January 2007, Celltop comes pre-installed as standard on the majority of
Alltel feature phones. Alltel is owner and operator of the largest network in
the United States and has more than 13 million customers.

Celltop is similar to the personalized short-cuts on the
desktop of a personal computer and is based on the widget concept, Celltop
solves the problem of content discovery by giving users the ability to
personalize and manage content in cells. This functionality dramatically
reduces the obstacle of multiple click-throughs and allows users to easily
reach their desired content faster and easier than before.

"The ability to market Celltop to service providers worldwide
coupled with the opportunity to continue to build on its original innovation
strongly positions Aricent for continued growth," said William Ho, research
director at Current Analysis, a Washington D.C.-based research and analysis
company.

"Celltop has been a tremendous success for Alltel Wireless,"
said Dow Draper senior vice president of data and voice products for Alltel.
"Celltop gives our customers easy, personalized access to important
information on their phones, providing an exceptional wireless experience."

The Celltop mobile client framework is available to network
operators delivering new services and products. The framework includes
ready-to-run cells such as inbox, stocks, weather, news, call-log and
ring-tones, and can be customized by network operators to offer a consistent
and branded user experience to encourage use of data and value-added
services. Consumers also have access to a whole host of subscription-based
cells including a cheap fuel locator, music downloads and streaming radio.

Cells currently in development offer multilingual capabilities
(including Spanish, Portuguese and Hindi). Additionally, Celltop incorporates
watermark technology allowing advertisements to be superimposed on the base
screen or wallpaper of the mobile handset. Network operators can offer
customers the choice of 'opt-in/opt-out' for delivery of this targeted
content.

"With Celltop, a greater range of consumers can now easily
interact with handheld data while harnessing the data capabilities of CDMA
and the global reach of GSM technology," said Sanjay Dhawan, president and
chief operating officer, Aricent. "Already available on handsets and backed
by a growing community of software developers, Celltop delivers content more
efficiently than other current solutions. Now, mobile service providers
worldwide can enrich the user experience and increase the adoption of
existing data networks and new revenue-generating services."

Alltel Wireless and Celltop were recognized as Best in Show at
the 2007 Emerging Technology Awards at the Cellular Telecommunications
Industry Association show and received the People's Choice Award and Best
Business/Productivity Application Award at the QUALCOMM BREW 2007 Developer
Conference. The Celltop interface and SDK are now generally available through
Aricent. For more information refer to http://aricent.com/celltop.

Keywords & tags: Celltop, content discovery, mobile widget, on device
portal, mobile user experience, mobile advertising, mobile sdk, alltel,
software development kit, CDMA, GSM, BREW, uiOne, J2ME, communications
software

About Aricent

With corporate offices in Palo Alto, California, Aricent is
the world's largest private communications software company. Aricent offers
software services and products that enable communications equipment
manufacturers, device manufacturers and service providers to improve
time-to-revenue and maximize efficiency. The company is owned by Kohlberg
Kravis Roberts & Co., Sequoia Capital and Flextronics International Ltd and
has more than 400 clients worldwide. For more information, visit
http://aricent.com.

About Alltel

Alltel is owner and operator of America's largest network and
serves more than 13 million customers. For more information about Alltel,
please visit http://www.alltel.com

Aricent and Celltop are trademarks of Aricent, Inc. in the United States
and/or other jurisdictions. All other trademarks are the property of their
respective owners.