AIS, Thailand

Amdocs, Global

Asiacell, Iraq

Atos Origin, Global

Billing Concepts, USA

Bouygues Telecom, France

Cerillion, GB

China Mobile

Cingular, USA

Comfone, Switzerland

Convergys, UK

DTAC, Thailand

ENMR, USA

Exelcom, Indonesia

FAROESE, Faroe Island

Fascel, India

Grameen Phone, Bangladesh

GSM Association, UK

Hola Paraguay

Hutchison, India

IS-TIM, Turkey

Indosat, Indonesia

International Turnkey Systems, Kuwait

MACH, Luxembourg

mobilkom austria

MOBIMAK, Macedonia

Mobtel, Serbia

Nextel, USA

NTT DoCoMo, Japan

Orange, France – India - Slovenia

P+T Luxembourg

ProMonte, Montenegro

Q-Tel, Qatar

STC Saudi Telecom

SFR Cegetel, France

Sopra Group, France

Swisscom Mobile, Switzerland

T-Systems, Germany

TDC Sunrise, Switzerland

Telcel, Mexico

Telecomadvisors, CALA

TeleGreenland

T-Mobile, Hungary - USA

Telenor Mobil, Norway

True Corporation, Thailand

VeriSign, USA

VIBO, Taiwan

VIPNet, Croatia

Vodacom, South Africa

Vodafone, Germany – New Zealand - UK

WSI Americas, Global