( BW)(SONIM-TECHNOLOGIES) Tourist Mobile Partners with Sonim
Technologies to Introduce First Standards-Based, IP Push-To-Talk
Services in Austria

    Business Editors/Telecommunications Writers

    INNSBRUCK, Austria--(BUSINESS WIRE)--April 23, 2007--


  Tourist Mobile deploys OMA Push-To-Talk-Over-Cellular solution for
                      tourists and rescue forces

    Tourist Mobile, one of the worlds leading Mobile Virtual Network
Operators (MVNOs), today announced that it has partnered with Sonim
Technologies, the leader in Push-To-Talk IMS solutions for mobile
operators, to launch Austria's first standards-based Push-To-Talk
system. Tourist Mobile's customers will now have early access to
Sonim's XP1 mobile "tough phone" along with Sonim's high performance
Push-To-Talk service.

    Sonim is helping Europe replicate Nextel's success in the United
States by bringing a comprehensive, standards-based Push-To-Talk
system to operators and enterprises across Europe. This standards
approach, combined with a unique ruggedized phone, is being embraced
by companies and operators including Dr. Materna/Vistream, KPN,
Telefonica Moviles, Selectric and Dialect, a large value added
reseller in Germany and Sweden.

    "With Sonim's XP1 tough phone and robust Push-To-Talk service, we
can better serve our two groups of customers: tourists who need a
ruggedized phone while hiking, skiing or at the beach and rescue
personnel who work in those same environments," explains Klaus
Leitner, CEO and founder of Tourist Mobile. "The Push-To-Talk feature
is ideal for these groups who want quick communications with parties
in their group, whether to find each other on the ski slopes, or in
the case of rescue personnel, to locate people in need of help."

    "While we've had good success with traditional mobile operators
like KPN and Telefonica, I'm excited about the new markets that
Tourist Mobile has tapped, both being ideal customers for our tough
phone and walkie talkie service," said Bob Plaschke, CEO of Sonim
Technologies. "We're very excited to be working with Tourist Mobile as
they are clearly one of most innovative mobile operators in Europe."

    About Sonim Technologies Inc.

    Sonim Technologies provides solutions that enable today's GPRS,
UMTS, EVDO, WiFi and WiMAX data networks to provide high-performance
VoIP applications and services. These are then optimised in order to
fulfill the productivity targets of mobile companies. Sonim's OMA PoC
1.0 Server, client and handset solutions represent the only business
class implementation of push-to-talk standards in the sector and form
the basis of an emerging suite of streaming IMS-compliant
applications. Sonim is based in San Mateo, California and has offices
in Bangalore, London, Stockholm and Madrid. For more information,
please visit the company's website: www.sonimtech.com.

    --30--AMC/ny*

    CONTACT: Abelson Group, Inc. for Sonim
             Jennifer Abelson, +1 917-445-4454
             jennifer@abelsongroup.com