JAMDAT Mobile to Cooperate with ATI Technologies to Develop 3D Wireless Entertainment Applications

Global wireless entertainment publisher JAMDAT Mobile
Inc. (NASDAQ:JMDT) announced today that it will cooperate with ATI
Technologies Inc., one of the leading providers of graphics, video and
multimedia products for desktop, workstation and notebook PCs, digital
televisions, cell phones and game consoles, to develop new 3D wireless
entertainment applications.
   "3D games are an important part of the future of mobile gaming and
by working with ATI, a leader in the 3D graphics space, we will
continue to offer the most sophisticated games for wireless, with
enhanced graphics and faster run times," said Mitch Lasky, Chairman
and CEO of JAMDAT Mobile Inc. "Our current 3D titles -- 'JAMDAT
Bowling 3D' and 'Tony Hawk's Pro Skater: 3D Mobile Edition' -- are
already immensely popular with consumers. Through our relationship
with ATI, we intend to publish 3D products that push the boundaries of
innovation and fun."
   "JAMDAT has driven the mobile market to new heights by developing
titles that consistently remain at the forefront of wireless
technology," said Neal Robison, Director of ISV Relations, ATI
Technologies Inc. "We are elated that JAMDAT will continue to push
visual quality and performance with their content by supporting ATI's
Imageon(R) 3D graphics in full hardware 3D gaming."

   About JAMDAT Mobile

   JAMDAT Mobile Inc. is a global publisher of wireless entertainment
applications, including games, ring tones, images and other content.
JAMDAT's application portfolio is based on original and licensed
intellectual properties and includes JAMDAT Bowling, Tetris(R),
Downtown Texas Hold 'Em, Lemonade Tycoon(R), Bejeweled(R), The Lord of
the Rings(R), Tony Hawk's(R) Underground and Scrabble(R). JAMDAT
distributes its applications through wireless carriers around the
world. For more information, please visit www.jamdat.com.

   Safe Harbor Statement -- JAMDAT Mobile Inc.

   This press release may include forward-looking statements within
the meaning of the Private Securities Litigation Reform Act of 1995,
including statements related to anticipated revenues, expenses,
earnings, operating cash flows, the outlook for JAMDAT's markets and
the demand for its products. Factors that could cause JAMDAT's actual
results to differ materially from these forward-looking statements
include its ability to integrate the acquisition of Blue Lava
Wireless, anticipated growth in the handset market, its ability to
effectively market and sell products in diverse market segments, its
reliance on a limited number of products and third-party vendors and
distributors, its ability to expand studio operations, increases in
fulfillment costs, disruptions to information technology systems,
unpredictable events and circumstances relating to international
suppliers, increased competition, government regulatory action and
general economic conditions. Please refer to JAMDAT's reports and
filings with the Securities and Exchange Commission for a further
discussion of these risks and uncertainties. Readers are cautioned not
to place undue reliance on forward-looking statements, which speak
only as of the date they are made. JAMDAT undertakes no obligation to
update publicly any forward-looking statements to reflect new
information, events or circumstances after the date they were made or
to reflect the occurrence of unanticipated events.

   (C)2005 JAMDAT Mobile Inc. JAMDAT, JAMDAT Mobile and the bubbles
logo are trademarks of JAMDAT Mobile Inc. All other trademarks are the
property of their respective owners.