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MITSUBISHI ELECTRIC AND PHONE.COM ANNOUNCE WAP INTEROPERABILITY TESTING

PARIS, France and REDWOOD CITY, Calif. (February 24, 2000) - Mitsubishi Electric, one of the worlds leading manufacturers of mobile handsets, and Phone.com, Inc. (Nasdaq: PHCM), a leading provider of mobile Internet software and services, announced today that they have initiated a project to verify the interoperability between their products. Wireless Application Protocol (WAP) interoperability tests will be conducted between Phone.coms UP.Link Server and Triums [email protected] (WAP) from Mitsubishi Electric France.

The intent of these tests is to enhance the compatibility of the two companies WAP-based products and services, ensuring that they will operate together independent of the manufacturer. The tests are an important step for both companies in further establishing WAP as a truly global standard for mobile data communication. Phone.com has been undertaking interoperability testing for WAP-compatible products and services with several vendors, and offers its test facility to WAP product developers, vendors, and operators in an effort to reduce interoperability testing time.

Mr. Yamanaka, president director general of MEF, said "We are delighted to be working with Phone.com on this project. By providing a connection to the Internet through a mobile phone, we will empower end-users with a handset that offers an easy solution to everyday life. Our first WAP product, the [email protected] (WAP), is both an advanced information gathering tool and an essential accessory for consumers and business users."

"Interoperability is an important step to effective WAP deployment in the mass market," said Jeff Damir, vice president of business development for Phone.com. "As one of the co-founders of the WAP Forum, we are committed to ensuring maximum interoperability for all suppliers of WAP equipment."

About Mitsubishi Electric France
MEF is the European Telecom division and wholly owned subsidiary of Mitsubishi Electric Corporation. Trium is the brand name of mobile phones by Mitsubishi Electric France. The current range of Trium handsets available consists of Galaxy, Astral, Geo & Aria. For further information visit www.trium-gsm.com.

About Phone.com
Phone.com, Inc. (Nasdaq: PHCM) is a leading provider of software and services that enable the delivery of Internet-based information services to mass-market wireless telephones. Using its software, wireless subscribers have access to Internet- and corporate intranet-based services, including email, news, stocks, weather, travel and sports. In addition, subscribers have access via their wireless telephones to network operators intranet-based telephony services, which may include over-the-air activation, call management, billing history information, pricing plan subscription and voice message management. Phone.com is headquartered in Silicon Valley, California and has regional offices in Belfast, Copenhagen, London and Tokyo. Visit http://www.phone.com for more information.

Except for the historical information contained herein, the matters discussed in this news release are forward-looking statements involving risks and uncertainties that could cause actual results to differ materially from those in such forward-looking statements. Potential risks and uncertainties include, but are not limited to, Phone.coms limited operating history, potential fluctuations in Phone.coms operating results, uncertainties related to Phone.coms long sales cycle and reliance on a small number of customers, Phone.coms dependence on the acceptance of its products by network operators and wireless subscribers, Phone.coms ability to adequately address the rapidly-evolving market for delivery of Internet-based services through wireless telephones, the need to achieve widespread integration of Phone.coms browser in wireless telephones, competition from companies with substantially greater financial, technical, marketing and distribution resources and the ability of Phone.com to manage a complex set of engineering, marketing and distribution relationships. Further information regarding these and other risks are included in Phone.coms Form 10-Q for quarter ended December 31, 1999, in its prospectus dated November 16, 1999 and in its other filings with the Securities and Exchange Commission.

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Phone.com, the Phone.com name and logo, MyPhone and the family of terms carrying the "UP." prefix are trademarks of Phone.com, Inc. All Rights Reserved. All other company, brand and product names may be marks that are the sole property of their respective owners.

For further information:

Contact Phone.com Worldwide Public Relations:
http://www.phone.com/news/mediacontacts.html

Mitsubishi Electric France
Kouji Kodera
+33 155 68 56 99
+33 155 68 57 43 (fax)
[email protected]

SLAM
(on behalf of Mitsubishi Electric France)
Anna Raby /Rachel Hall
+44 (171) 841 5523
+44 (171) 841 5777 (fax)
[email protected]