- British Telecom (BT) (11)
- BT provides telecommunication services, including long-distance and international calls. Also manages private networks and supplies mobile communication services.
- One.Tel
 - Provides cheap national and international calls from landlines and mobiles, as well as Internet services. - Fujitsu Telecommunications Europe Limited
- Supplier of telecommunications products and services.
- SITA
- Telecommunication and information processing solutions connecting customers in over 225 countries to a global data network.
- FLAG Telecom
- Offers a broad range of products and services to international carriers, service providers, and other telecommunications companies.
- Swiftnet Ltd
- Licensed carrier providing the business world with voice, fax and value added Internet based telecommunication services.
- TalkTalk
- Low cost home phone service for U.K. customers from the Carphone Warehouse. Service is free to join and allows free calls to other TalkTalk users.
- Martin Dawes Systems
- Provider of customer care systems for the telecoms and service provision industry.
- Voice Integrated Products Ltd
- Provides voice and telephony processing and support for customer relationship management systems.
- TelecomsAdvice
- Provides impartial information to small and medium U.K. businesses on the effective, efficient, and economical use of telecoms and ICTs.
- COLT Telecommunications (1)
- Band-X
- Screen-based global commodities exchange for the trading of international wholesale telecom minutes and bandwidth.
- Redstone Telecom (2)
- hSo
- Provides broadband Internet access, phone services, and online data backup for U.K. businesses.
- Alcatel UK
- JKC
- Supplies viewstation video and audio conferencing systems plus multimedia presentation equipment and web hosting for businesses.
- UbiNetics
- Developers of mobile solutions and products for consumer, commercial, and corporate users.
- Opera Telecom
- International independent telecommunication company providing SMS premium services, number services, billing, IVR, co-location, and virtual Telco services.
- Opal Telecommunications
- Offers discounted telephone service over the BT network.
- Invsat Limited
- Project manages and delivers radio and VSAT solutions, satellite/broadband networks, and VPNs within global maritime, oil and gas, government, and emergency services sectors.
- FleXtel
- Free personal numbers with online Internet connection.
- Oak Telecom Ltd
- Offers advanced voicemail and call logging solutions.
- SuperLine
- Offers cheap international calls, and low cost U.K. and mobile phone calls.
- Telecommunications Managers Association (TMA)
- U.K. telecoms user group containing industry news, technical and regulatory information and details of the association and its activities.
- Maximum Network Solutions Ltd
- Admiral Group of Companies
- Supplier of office equipment and telecommunications, presentational, and conferencing products.
- Westlake Communications
- Offers video conferencing services, Internet access, phone services, and more.
- Greenwoods Communications
- Independent network solutions provider to the communications industry. Supplies a range of telecom infrastructure services for network operators and OEMs.
- Planet Talk
- Offering cheap local, national, and international calls from landlines and mobiles.
- Solar Communications
- Specialises in telephone systems, video conferencing, cordless telephony, CTI applications, Cat 5 structured cabling and data connectivity/networking.
- Central Telecom
- Offering integrated telephony computing, voice and data communications.
- Toucan
- Offers low cost consumer telephone services.
- Localtel (1)
- 3W Telecom
- Offers mobile phone services, freephone, prepaid phone cards, web design, a Berkshire local pages business directory, and more.
- Telewest Broadband
- Offering cable telephone and TV services to a number of London boroughs.
- Torch Telecom
- GoTalk
- Residential telephony service offering cheap international and local calls.
- World Telecom (1)
- Voicenet
- Provides U.K. and international phone service as well as Internet connections.
- High Speed Communications (HSC)
- Network service provider specialising in high bandwidth services for U.K.-based business.
- Highland Telematics Ltd
- Represents the interest of over 200 Scottish freelance teleworkers.
- Diplomat Communications Ltd
- Two-way radio equipment manufacturer.
- Telesave
- Discount long distance, national, and local telephone services.
- Netcom Communications
- Offers customers throughout the U.K. and Ireland a source point for telecom requirements.
- UKCall.com
- Save on local, national, and international calls from fixed line or mobile phones, business or home use.
- Genesis Telecomunications
- Voice, video, and data networks solution provider.
- King Communications
- Specialises in communications technology and digital equipment, including home security systems, wireless phones, paging systems, and more.
- Unitel Communications
- Offers pre-paid phonecards, voicemail, turnkey systems, interactive voice response programmes, and more.
- Kingston Business Communications
- Provides voice communications systems and services to businesses throughout the U.K.
- Entryphone Company Limited
- Manufacture and installation of audio and video door telephone systems.
- Datasharp I.T.
- Offers communications equipment and software.
- Ashland Communication Equipment Ltd
- Provides communication equipment and service.
- Digital Exchange Solutions
- Supplier of telecommunication solutions including videoconferencing systems and voice mail systems to businesses throughout the U.K.
- France Télécom UK
- Talkback
- Cheap international telephony and call back service for overseas.
- Totalise Telecommunications
- Offers customers savings on their local and long distance telephone calls.
- Atlantic Telecom
- Cable & Wireless UK
- Energis (1)
- OiT@
- Maintel
- Maintel provides total voice and data solutions for companies. From telephone system installation to call traffic, business broadband, VoIP, and unified communications.
- SoHo66 Virtual Office
- Business-to-business provider of Voice over IP (VoIP) numbers, virtual PBX, virtual receptionist, fax to email, email and domain hosting, and teleconferencing services.
- THUS
- Providers of voice, data, and Internet services.
- Tesco Home Phone
- Provider of low cost home phone packages designed to save money on calls from landlines.
- Vodafone UK
- Offers mobile phones, mobile broadband, mobile email, and fixed line internet access.
- ntl:Telewest Business
- Delivers communication solutions for private and public sector organisations including online conferencing using Telecoms 2.0. Also operates one of the largest alternative next generation networks in the U.K.
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