Internet, Telephone, VOIP & WiFi

Netstar IT Support
Cloud computing, mobile, VoIP, backup and security services. 146-148 Clerkenwell Road, Clerkenwell, Camden, EC1R 5DG.
Sentronex Limited
Provides IT support solutions. 42 Southwark Street, Southwark, SE1 1UN.
iNet Telecoms Ltd - Voipfone
Provides telephone services. 227 Marsh Wall, Tower Hamlets, E14 9SD.
Albion Computers
Internet access services. 49 Brekeley Square, Westminster, W1J 5AZ.
Venus Business Communications
VOIP phone systems, colocation, server hosting and fibre network. 24 Denmark Street, Covent Garden, London WC2H 8NJ.
Call South Africa
Low cost calls to both fixed and mobile telephones in South Africa.
Fresh Tech
IT support solutions. 54 - 58 Tanner Street, Southwark, SE1 3PH.
Telephony and VOIP services and IT support. 10 Livonia Street, Westminster, London, W1F 8AF.
Getting Tech Ltd
Network solutions and internet access services. 37 Springfield Gdns, Brent, NW9 0RY.
Mobile, TV and internet services. High Holborn House, 52-54 High Holborn, Camden, WC1V 6RL.
The Briars Group
Network design and supply, security, network support, remote access solutions, internet services and website design. 1 Poultry, The City, London, EC2R 8JR.
IP Solutions
Provider of hosted VoIP, mobile, call management and inbound calling solutions to businesses. 9 Devonshire Square, The City, London, EC2M 4YF.
Macdaddy IT Ltd
Network solutions for business and home. West Heath Yard, 174 Mill Lane, Camden, NW6 1TB.
SITS Technology
Various types of telephone and internet services. Holborn Gate, 330 High Holborn, City of London, WC1V 7QT.
London Web
VOIP, internet, hosting and support. Unit 4, Lismarine Industrial Estate, Security House, Elstree Road, Elstree, London, WD6 3EE.
Plant Solutions Ltd
Offers broadband connection, internet and wireless solutions. 484 Chiswick High Road, Hounslow, W4 5TT.
Spitfire Technology Group
Broadband, IT and telecomms services. 6-7 SBBC, Ponton Road, Wandsworth, London, SW8 5BL.
Hosting, IT support and network services. Southbank House, Black Prince Road, Lambeth, London, SE1 7SJ.
New Call Telecom
VoIP, land line and broadband services. 27A Floral Street, Westminster, WC2E9EZ.
Vital Telcom
UK provider of hosted business phone systems and integrated communication solutions within the Cloud. Services include the allin1number; hosted PBX, desktop and mobile apps.
SpecTronics UK
IT Management and support for businesses and homes. 8 Lombard Road, Wimbledon, Camden, SW19 3TZ.
Orbex Solutions Ltd
Specialized in VoIP and hosting services. Accurist House, 44 Baker Street, Westminster, W1U 7AL.
Provides broadband and telecoms services. Opening Timing: Monday to Friday 09:00-18:00. 35 Topsfield Parade, Crouch End, Haringey, N8 8PT.
No-Problem Technologies
VoIP, domains, hosting, IT solutions and web design for small to medium-sized businesses. 27 Paxton Place, Gypsy Hill, London, SE27 9SS.
BiteBug Ltd.
Provides network and sever management services. Opening Timing: Monday to Friday 09:00-13:00 and 16:00-19:00. 14, Tiller Road, The Docklands Business Centre, Tower Hamlets, E14 8PX.
Provides wide range of VoIP phones. Opening Timing: Monday to Friday 08:00-18:00. 25-29 Harper Road, London Bridge, Southwark, SE1 6AW.
Oakland Associates
Provides IT Solutions, support and consultancy services for London businesses. Westmead House 123 Westmead Road, Sutton, Surrey, SM1 4JH .
Fursey McHughs TechTalent
Internet TV, wireless networks, internet setup and security. 15 Lindfield Gardens, Camden, NW3 6PX.
Calling Places Limited
Offers range of telecommunications solution from VoIP technology to powerful connectivity and internet access tools. Finance House, 2A Maygrove Road, Kilburn, Camden, NW6 2EB.
Mobile devices and security services. The Broadgate Tower, 20 Primrose Street, City of London, EC2A 2EW.
NM Cabling Data Cabling London
Data cable services, network cabling and AV audio visual cabling in London and South East.
Comodo Security Solutions Limited
Provides internet and mobile security services. 159 Praed Street, Westminster, W2 1RL.
Rez Computers
Wireless local area network, internet training and setup services. 128 Balfour House, 741 High Road, Barnet, N12 0BP.
VOIP and internet phone systems, business IT support and maintenance. 64 Clifton Street, London EC2A 4HB.
Cloud computing, IT consultancy, telephone systems, web and internet services. One Hardwicks Square, Wandsworth, SW18 4AW.
Wide range of VoIP services. 1 Castle Lane, Westminster, SW1E 6DR.
tateside Group
Networks and telecoms, including wireless, LAN, WAN and VOIP. 3rd Floor, Blue Fin Building, 110 Southwark Street, Southwark, London SE1 0SU.
Intelligent managed services provider, offering businesses connectivity, computing and intelligent services and solutions. 
Telekomm Solutions
Provides telecom and network solutions. Daws House, 33- 35 Daws Lane, Mill Hill, Barnet, NW7 4SD.
London Hosted
VOIP, SIP and hosted IP for business. 15 Bowling Green Lane, Farringdon, London, EC1R 0BD.
Atlas Computing
Provides internet services. Opening Timing: Monday to Saturday 11:00-19:00. 65 Balham Hill, Wandsworth, SW12 9DR.
iPod, iPad and iPhone repair parts and services. Unit 15 City Business Centre, Lower Road, Rotherhithe, London, SE16 2XB
Easaphone Services
Telecommunication and secure access services. Opening Timing: Monday to Friday 09:00-17:00. 29A Greencroft Gardens, Camden, NW6 3LN.
offers express mail service for iPhone, iPad and iPod. 64 Charlotte Street, West End, London, W1T 4QD
Specialized in network services. St Olav’s Court, City Business Center, Lower Road, Southwark, SE16 2XB.
BTA Limited
IT services for business, business internet, device solution and IT networks. Opening Timing: Monday to Friday 09:00-17:30. 1 Delta Park, Smugglers Way, Wandsworth, SW18 1EG.
PC Computer Problems
Provides network services including wireless and cable connections. 319 - 323 Battersea Park Road, Wandsworth, SW11 4LT.
Hosted VoIP, technical and WiFi support. 3-5 Swallow Place, Oxford Circus, London, W1B 2AF.