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