Onecom vs Gamma Communications
Onecom edges Gamma in a genuinely close call for UK business comms
Independently scored · last reviewed June 2026
Onecom and Gamma Communications are two of the UK's most credible independent business communications providers, and on paper they overlap considerably. Both offer connectivity, telephony and managed IT/cyber; both serve SMEs through to enterprise; and both score almost identically on Compare Business Costs (77 vs 76). The differences that matter are structural rather than obvious. Onecom is the UK's largest independent reseller, built around a tight Vodafone relationship and a genuine single-supplier converged stack, mobile included. Gamma owns its own UK network, sits on the FTSE 250, and has built one of the strongest UCaaS portfolios in the market, particularly around Microsoft Teams Phone and its own Horizon platform. Neither publishes clean pricing online; both are relationship-led sales. The tension here is between Onecom's breadth and mobile credentials versus Gamma's network ownership, financial solidity and deeper telephony specialism. For most buyers, the right call will hinge on whether mobile is in scope and how much UCaaS depth matters.
Side by side
| Metric | Onecom | Gamma Communications |
|---|---|---|
| Overall score | 77 ✓ | 76 |
| Categories covered | 3
| 3
|
| Trustpilot | 4 ✓ | 2.6 |
| Breadth of service | 78 ✓ | 72 |
| Value for money | 64 | 65 ✓ |
| Support & service | 70 ✓ | 68 |
| Reliability | 82 | 88 ✓ |
| Reputation | 74 | 74 |
| Founded | 2002 (as Premier Telecom; rebranded Onecom) | 2001 (founded by Phil Corbishley and Paul Banner) |
| Head office | Onecom House, 4400 Parkway, Solent Business Park, Fareham, Hampshire PO15 7FJ | Newbury, Berkshire, England |
Category by category
Gamma owns its own UK network and scores 88 on reliability versus Onecom's 82, giving it a structural edge for connectivity buyers who need proven uptime.
Gamma's UCaaS portfolio (Horizon, SIP trunking, Teams Phone and Cisco Webex) is Frost & Sullivan recognised and market-leading; Onecom's hosted voice offer is solid but narrower in UCaaS depth.
Onecom's managed IT and cyber stack, bolstered by its Matrix IT acquisition and 650-plus staff, gives it a broader integrated managed services footprint than Gamma's growing but more recently added cyber offering.
Which should you choose?
Onecom is the stronger fit if you want a single UK supplier to converge Vodafone business mobile, fixed connectivity, cloud telephony and managed IT. It suits SMEs and mid-market businesses that value vendor accreditation and scale over price transparency.
Full Onecom review →Gamma is the better call if hosted telephony or UCaaS is your priority, particularly Microsoft Teams Phone or Cisco Webex, and you want a financially solid, network-owning provider behind it. It also suits buyers who prefer to work through a channel partner rather than direct.
Full Gamma Communications review →Onecom is our narrow overall pick at 77 versus Gamma's 76, primarily because of its broader single-supplier stack, strong mobile credentials and managed IT depth. Gamma is genuinely the stronger choice on telephony and connectivity in isolation, and its FTSE 250 stability and network ownership carry real weight. If mobile is not in scope and UCaaS is your main purchase, Gamma deserves serious consideration before settling on Onecom.
FAQs
Can I switch from Gamma to Onecom (or vice versa) without losing my existing phone numbers?
Yes. UK business numbers can be ported between providers under Ofcom rules, and both Onecom and Gamma support number porting. That said, confirm your specific number ranges with both parties before signing anything. Allow several weeks for the process and check your current contract for any early-termination penalties before you initiate a switch.
Which is better suited to a smaller business, Onecom or Gamma?
Both serve SMEs, but Onecom will typically engage smaller businesses directly, particularly for mobile-led converged deals. Gamma serves micro and small businesses largely through its 1,500-plus channel partner network, which can mean more variation in the sales and service experience. If you want to deal direct and need mobile bundled in, Onecom is the more straightforward path for a smaller business.
Do either of them offer transparent, published pricing?
Neither Onecom nor Gamma publishes detailed pricing online. Both operate through quote-based, relationship-led sales, and Gamma's channel-partner model adds a further layer, as the reseller sets the end price. Budget time for a formal quote process with both, and ask for itemised pricing per service line so you can compare on a like-for-like basis.