Gamma Communications vs BT Business
Gamma Communications edges BT Business in a genuinely close UCaaS and connectivity contest
Independently scored · last reviewed June 2026
Gamma Communications and BT Business are two of the most credible B2B communications providers in the UK, but they come at the market from very different angles. BT Business is the incumbent: it owns Openreach, runs EE, and has the kind of network reach and brand weight that no challenger can match outright. Gamma is a FTSE 250 specialist that has quietly built one of the UK's strongest UCaaS and telephony portfolios, with its own network and a growing managed security arm. On our overall scores, Gamma edges ahead 76 to 74. Two points is as close as it gets. The real decision comes down to what matters most to your business: BT Business scores higher on network breadth and reliability (90 vs 88), while Gamma wins on value and support. For larger enterprises, the case for BT Business is stronger than the headline score suggests.
Side by side
| Metric | Gamma Communications | BT Business |
|---|---|---|
| Overall score | 76 ✓ | 74 |
| Categories covered | 3
| 3
|
| Trustpilot | 2.6 | 3.7 ✓ |
| Breadth of service | 72 | 78 ✓ |
| Value for money | 65 ✓ | 55 |
| Support & service | 68 ✓ | 60 |
| Reliability | 88 | 90 ✓ |
| Reputation | 74 ✓ | 68 |
| Founded | 2001 (founded by Phil Corbishley and Paul Banner) | Business unit formed in 2013 from the split of BT Retail (later reorganised into BT Enterprise in 2018); parent BT Group traces to British Telecom, privatised 1984, with origins over 180 years old |
| Head office | Newbury, Berkshire, England | One Braham, London, UK (BT Group) |
Category by category
BT Business wins on connectivity through sheer network ownership. Openreach for fixed and EE for mobile gives it unmatched UK reach and a reliability score of 90, slightly ahead of Gamma's 88.
Gamma Communications leads on telephony. Its Horizon cloud phone system, SIP trunking, Teams Phone and Cisco Webex portfolio has earned Frost and Sullivan recognition, and UCaaS is Gamma's core specialism rather than one product line sitting alongside many others.
Both providers offer credible managed cyber-security. Gamma has a genuine SOC and MDR capability; BT Business brings thousands of security specialists and managed SASE with Fortinet, Palo Alto and Cisco. This one is too close to split.
Which should you choose?
Choose Gamma Communications if your priority is hosted telephony or UCaaS, particularly Horizon, Microsoft Teams Phone or Cisco Webex, and you want a financially solid, network-owning UK specialist. It also suits SMEs and mid-market buyers who care about value and are comfortable buying through a reseller channel.
Full Gamma Communications review →Choose BT Business if you're a mid-market or enterprise buyer who needs a genuine single supplier across fixed connectivity, mobile (EE) and managed security, or if nationwide network resilience and 24/7 enterprise support are non-negotiable and budget is less of a constraint.
Full BT Business review →Gamma Communications takes the overall pick at 76 vs BT Business's 74, largely on the strength of its UCaaS portfolio and better value score. Two points is a marginal margin, though, and BT Business is the stronger option wherever network reach, EE mobile or full-spectrum enterprise services matter most. Businesses choosing purely on telephony and UCaaS should lean Gamma; those wanting one incumbent to own connectivity, mobile and security end-to-end will find BT Business the more compelling case.
FAQs
Can I switch from BT Business to Gamma Communications without significant disruption to my phone numbers?
In most cases, yes. UK business number porting rules apply to both providers, so existing geographic and non-geographic numbers can be transferred. Gamma's SIP trunking and Horizon platform are designed to handle ported numbers, and many businesses migrate with minimal downtime. The complexity depends on how many numbers you have, whether you're on BT's analogue or ISDN lines, and how tightly your systems are integrated, so get a detailed migration plan in writing before signing anything.
Which provider is better suited to a smaller business with, say, fewer than 20 staff?
Gamma Communications is generally the stronger fit at small-business scale. Its Horizon hosted phone system is widely used by SMEs, its channel partners tend to offer more flexible packaging, and its value score (65) is meaningfully higher than BT Business's (55). BT Business serves small businesses too, but its pricing and contract structures are better optimised for larger accounts, and its customer-service reputation at the smaller end is mixed based on Trustpilot data.
How do their contracts typically work, and is either provider more flexible on terms?
Neither provider publishes standard contract lengths prominently online, and both operate partly through partners where terms vary. Gamma's partner-led model means flexibility can depend heavily on which reseller you use, with some offering shorter initial terms than BT's typical enterprise agreements. BT Business contracts at enterprise level tend to be multi-year and can be harder to exit early without penalty. For either provider, negotiate the minimum term, early exit clauses and SLA credits before committing, and ask specifically what happens at the end of the PSTN switch-off if you're still on legacy lines.