With the UK PSTN/ISDN switch-off underway, businesses are moving to cloud telephony. Compare hosted VoIP platforms, contact-centre features, Teams integration, per-user pricing and business mobile bundles.
Last reviewed June 2026
Comms, connectivity, IT, cyber, mobile and energy from one UK provider.
Best for: SMEs and mid-market businesses that want to consolidate telecoms, connectivity, IT, cyber and energy with a single financially stable UK supplier, ideally with a managed account relationship rather than a call centre.
Technology led, people driven, the UK's largest independent B2B provider of voice, connectivity, mobile, IT and cloud.
Best for: UK SMEs that want to consolidate broadband and leased lines, phone systems, mobile, managed IT, cyber, and business energy under a single supplier with one UK support desk.
The UK's largest independent business communications provider: mobile, connectivity, cloud comms and IT
Best for: SMEs and mid-market organisations that want a single UK partner to bring together Vodafone business mobile, fixed connectivity, cloud telephony, contact centre and managed IT and cyber services. A good fit if vendor accreditation and scale matter more to you than rock-bottom transparent pricing.
The network that powers one in four UK businesses with Ethernet, connectivity and managed network services for SMEs, enterprise and the public sector.
Best for: SMEs through to enterprise and public-sector organisations that want business connectivity (fibre, leased lines, SD-WAN) alongside hosted voice/UC and managed networking and security from a single established UK provider. Also suits channel resellers looking for a connectivity-led supplier.
UK-owned, network-backed communications, connectivity and security for business.
Best for: SMEs up to enterprise and public sector buyers who want a financially solid, network-owning UK provider for hosted telephony, UCaaS and connectivity. Particularly well suited to organisations buying through a reseller or partner, or those standardising on Microsoft Teams Phone or Cisco Webex.
Behind brilliant things, the UK's incumbent provider of business connectivity, comms and security.
Best for: Mid-market to enterprise and public-sector buyers who want a single, financially-secure incumbent to handle nationwide connectivity, hosted voice, EE mobile and managed security with 24/7 support. Best suited to organisations that put network reach and resilience above lowest price.
One partner. Cloud communications, connectivity and cyber security, joined up.
Best for: Mid-market businesses and growing SMBs that want one managed partner to pull together cloud telephony, a Five9/Teams contact centre, connectivity and managed IT or cyber security. A better fit if you value breadth and scale than if you're hunting for the lowest price.
Cloud, fixed and mobile connectivity for UK businesses and the public sector
Best for: Mid-market, enterprise and public-sector organisations that want converged fixed and O2 mobile connectivity, SD-WAN, and managed cloud and security from a single large-scale UK provider.
The UK's most-awarded VoIP and broadband provider for small businesses and sole traders.
Best for: Sole traders, freelancers and micro-businesses with 1-10 users who want cheap, no-fuss VoIP and/or broadband from one provider and have no intention of involving IT support or paying for enterprise-grade connectivity.
Business phone systems for the UK SME market
Best for: UK SMEs that want a fully managed, single-supplier hosted phone system with proprietary hardware, on-site UK installation and training. Worth considering if you're comfortable with a long-term lease and would rather have an all-in-one bundle than flexibility, transparent pricing or short contracts.
One platform for cloud telephony, contact centre and communications APIs.
Best for: Mid-market and enterprise organisations, particularly those running multiple sites, contact-centre-heavy operations or international teams, that already have solid connectivity in place and want one well-accredited cloud platform covering phone, UC and contact centre.
For most micro and small businesses doing general browsing, email, video calls and a handful of cloud apps, FTTP full-fibre broadband is fast and affordable enough. A leased line (dedicated/DIA) makes sense once you have around 30+ users, need guaranteed upload speeds, run public-facing or hosted services, or simply cannot afford downtime. What you get with a leased line is uncontended capacity, symmetric speeds and a real uptime/fix-time SLA. The practical test: work out what an hour of internet downtime costs your business, then weigh that against the leased-line premium.
The old analogue phone network (PSTN) and ISDN lines are being switched off, completing by 31 January 2027. Anything running over a traditional copper line will stop working. That includes desk phones, but also fax machines, alarm systems, door entry, lift emergency phones and some card payment terminals. You need to move phones to an internet-based option (hosted VoIP, SIP or UCaaS like Teams Phone), keep your existing numbers by porting them, and audit any alarms, lifts or card machines that use a phone line. Don't leave it late: porting takes 10-14 working days and you'll want to run old and new in parallel for a couple of weeks.
Brokers (energy 'TPIs') can save time and money, particularly if you'd rather not ring round suppliers yourself. The catch is how they're paid. In energy, commission is an 'uplift' baked into your unit rate, typically 0.5-3p/kWh. Anything above around 3p is worth challenging. Since October 2024, brokers must disclose commission in writing to all business customers, so ask for the uplift in pounds and pence before you sign anything. Also worth knowing: a Letter of Authority only lets a broker get quotes on your behalf. It is not a contract to buy, which you must sign separately.
Yes. Business telecoms and energy contracts have minimum terms and early-termination charges. For telecoms, Ofcom requires that small businesses (10 or fewer employees) aren't auto-renewed into a new minimum term without active consent, and that exit terms be fair and proportionate. Since January 2025, you can usually exit penalty-free if a provider raises prices mid-contract beyond what was clearly disclosed. To switch cleanly: note every contract's end date and notice period, give notice in writing on time, use One Touch Switch for broadband, and port your phone numbers. For energy, switch as your contract ends to avoid deemed rates.
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