118 Limited 24 Seven Communications Ltd 4D Interactive Ltd
Atlas Interactive Group Limited
British Telecommunications Plc
Callax Ltd Callgenix Ltd CFL Communications Limited Cheers International Sales Ltd Citrus Telecommunications Ltd Colt Technology Services Connect Telecom UK limited Core Communication Services Limited Core Telecom Ltd
Digital Select Ltd
Edge Telecom Ltd EE Ltd Eircom UK Ltd Elephant talk Communications PRS U.K. Ltd Equiinet Technologies Ltd
Gamma Telecom Limited
Hutchison 3G UK Ltd
InTechnology plc Invoco Ltd Invomo Limited IV Response Limited
Jessico Networks Ltd Jtec UK Limited
Kcom Group Ltd
Level 3 Communications UK Limited
Magrathea Telecommunications Ltd
NodeMax Limited
O-Bit Telecom Ltd Oxygen8 Communications UK Ltd
Planet Numbers Ltd Premier Voicemail Ltd
QX Telecom Ltd
Relax Telecom plc
Simwood eSMS Limited Sky Telecom Ltd Skycom Ltd Starcomm Limited Swiftnet Ltd Syntec Ltd
TalkTalk Communications Ltd Telecom 2 Limited Teledesign Ltd Telefonica UK Ltd TelXL Limited The Number UK Limited Titanium Limited
Vectone Network Limited Verizon Enterprise Solutions Virgin Media Limited Virgin Mobile Telecoms Limited Virtual Universe Limited Vodafone Limited
WaveCrest (UK) Ltd.
Zaf Telecom Ltd