T2K Voice & Data supplies business phone systems in London, from single-office firms in Shoreditch and Farringdon to multi-floor teams in the City, Canary Wharf and the West End. We're a UK-based telecoms provider with 35+ years' experience, serving customers across the country. We set up Gamma Horizon, 3CX, Mitel and three other leading VoIP platforms remotely, and keep your 020 numbers working throughout the move.
T2K Voice & Data is an independent, UK-based telecoms provider serving customers across the country, London included. Most London phone system projects don't need anyone on site: hosted VoIP platforms are configured remotely, handsets arrive pre-provisioned and ready to plug in, and 020 numbers move across through the network. When a job does need a visit, such as a DECT survey across several floors or a comms-room rack, we'll tell you before you sign.
Unlike VoIP-only resellers, T2K covers the full telecoms stack for London offices: cloud phone systems, on-premise PBX, SIP trunks, Microsoft Teams calling, business broadband, leased lines and mobiles. You get one supplier and one support line, instead of three providers blaming each other when calls drop.
London has more private-sector businesses than any other UK region: 1.04 million at the start of 2025. Those businesses range from banks and insurers in the City and Canary Wharf to start-ups around Old Street, law firms in Holborn and media agencies in Soho, and each cluster asks something different of its business telephone system.
Financial and legal firms tend to need compliant call recording, resilient SIP or hosted platforms and clean number presentation across several offices. Tech and creative teams usually want softphones, Microsoft Teams calling and the freedom to move desks, floors or co-working spaces without an engineer visit.
Retailers and hospitality venues in the West End and Covent Garden need call queues that cope with peaks, plus simple handsets staff can use from day one. Whichever group you're in, the move off ISDN and analogue lines is the same job: audit what you have, choose the platform that fits, port your 020 numbers and cut over out of hours.
Every London 020 number can move to a VoIP phone system or divert straight to a mobile. That includes the 020 7, 020 8 and 020 3 ranges, often written as 0207, 0208 and 0203. Your clients keep dialling the same number; only the way it reaches you changes.
Moving to Gamma Horizon, 3CX, Mitel or another platform? Or would you rather calls simply ring your mobile? Either way, your existing London 020 number comes with you. T2K Voice & Data handles the porting from start to finish, with no gap in service and no lost calls.
T2K Voice & Data supplies six business telephone system platforms to London firms, from fully hosted VoIP to on-premise PBX. We aren't tied to one vendor, so the recommendation follows your call volumes, sites and integrations, not our margin.
The UK's most widely used hosted business phone system, run on Gamma's own UK network. A strong fit for London offices that want reliable cloud telephony without an on-site PBX or in-house telecoms skills.
A software IP PBX with deep CRM integration, popular with London professional services firms and sales floors that live in Salesforce, HubSpot or Zendesk. T2K Voice & Data is a 3CX Titanium Partner.
An enterprise unified communications platform for larger London organisations, including multi-site firms and regulated businesses that need on-premise control or contact-centre features. T2K has decades of Mitel experience.
Cisco Webex calling, meetings and messaging delivered over Gamma's UK carrier network. Well suited to Soho and Shoreditch agencies whose staff split their week between the office, home and client sites.
The simplest way to move a London shop, surgery or small office off traditional analogue lines. Keep your 020 number and your existing handset, with no new hardware required.
A flexible UCaaS platform that puts calls, messaging and meetings in one app, managed through a single self-service portal. A good match for London teams already running on Microsoft 365.
Questions we regularly hear from London businesses comparing VoIP providers and phone systems.
We supply business phone systems and VoIP across every London postcode district, from the City and West End to the outer boroughs. Expand a group below to find your area.
Not seeing your postcode? Get in touch — we serve customers right across the UK.
We have dedicated pages for four of London's busiest business districts, and supply phone systems across the Home Counties and the South East. Distances are straight-line from central London.
Talk to T2K Voice & Data about business phone systems and VoIP for your London office. Keep your 020 numbers, cut over out of hours, and get honest advice from a UK team with 35+ years in telecoms.
