- BT Equinox Services
- Nine Telecom
- Vodafone UK Limited - Specific CUPID code 007
8x8 UK Limited
Andrews & Arnold
AQL/Telepohny Services
Aquiss
B4RN
Barritel Ltd
Bicom Systems
BT
Buzz Networks
Callagenix Ltd
Causeway Telecom
Central Technology Ltd
Chess LTD
Circle Loop
Cloudcall Ltd
COLT
Coms.com
Connexin
Content Guru
Core Telecom
C&W (Cable & Wireless)
Daisy Communications (now Shell Energy)
Dial9
Digital Space
DRD Communications Ltd
DWS
Easynet
Eclipse
Edge Telecom
EE
Entranet
Equiinet/Switch
Essensys Ltd
Eurobell (Holdings) Limited
Excell Group
Firstcom
FleXtel
Fleur Telecoms
Fulcrum
Gamma Telecom
GCI Network Solutions
Global4
Global Crossing (UK) Ltd
Gradwell
Hello Telecom UK
Hive Telecom
Hyperoptic
IDnet
i-Net Communications/Telecoms
iHub
Inclarity plc
Invoco
Invomo
IP Wholesale LTD
John Lewis
Kalnet4U (Tamar)
KCOM (Affiniti)
Kinex
Level 3
Liquid 11
Localphone
Magrathea Telecommunications
MDNX Enterprise Services Ltd
Metronet UK
Microtalk
Mintaka
Net Solutions Europe
Net-Work Internet
Network Services Ltd
Nexbridge
NFON UK
Node4
Nodemax
NowTV
NSN
Numbergroup Network
Numbers Plus
One Bill
Orange
Orbital
OrbTalk
Origin
Post Office
PlusNet
Phone Co-Op
Pulse8
Radius Communications
Rainbow Telecoms
Red Matter (Natterbox)
Redcentric
Resilient PLC
RingCentral
Simwood
Six Degrees
Shell Energy
Sky
Skype
Soho66
Spitfire
SSE
Suretec
Swiftnet
Syntec
TalkTalk
Telappliant
Telecom2 Ltd
Telephony Services
Teleware
Telserve
TelXL
Timico
Tipicall
Thus Plc
Twilio
Unicom
UNO
Utility Warehouse
Verizon UK Ltd
Virgin Media
Vodafone
Voiceflex
Voicehost
VOIP Unlimited
VoIPfone
VoIPstudio
VoIPtalk
Vonage
Voneus
Voxbone SA
Wavecrest
West
Wightfibre
Xinix
XLN
X-On (Storacall)
Yay Ltd
Your Communications
Zen Internet
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