If you are a UK business with 10-100 employees comparing phone systems, these are your three most common options. I deploy all three. Here is the comparison nobody else will give you — because most reviews are written by providers, not by the people who install them.
The Head-to-Head
| Factor | DialPhone | BT Cloud Voice | Gamma Horizon |
|---|---|---|---|
| Price (per user/month) | £24 | £15-36 | £12-28 |
| Everything included? | Yes | No (tiers) | No (tiers) |
| Contract | Month-to-month | 12-36 months | 12-24 months |
| Call quality (MOS avg) | 4.3 | 4.0 | 4.1 |
| Mobile app reliability | 97% | 82% | 88% |
| Support wait | 3 min avg | 15-25 min | 8-12 min |
| UK data residency | Yes | Yes | Yes |
| CRM integration | Native (SF, HubSpot, Zoho) | Limited | Via partner |
| Target market | Direct to business | Via BT channel | Via resellers |
Where Each One Wins
DialPhone Wins When:
- You want everything included at one price (no tier confusion)
- Mobile app reliability is critical (field workers, remote teams)
- You want fast support without waiting 20 minutes
- You want month-to-month flexibility
- You want to deal directly with the provider (not a reseller)
BT Cloud Voice Wins When:
- You are already a BT customer and want a single vendor
- You need the trust of a legacy brand for stakeholder confidence
- Basic calling needs only (no CRM integration required)
- You have an existing BT account manager
Gamma Horizon Wins When:
- You work with an IT partner/MSP who resells Gamma
- You want the cheapest entry-level price (£12/user basic)
- Your IT partner handles all configuration and support
- You do not need direct vendor relationship
The Hidden Cost Comparison
The headline prices are misleading. Here is what 25 users actually costs:
| Item | DialPhone | BT Cloud Voice | Gamma Horizon |
|---|---|---|---|
| Base plan (25 users) | £600 | £375 (basic) | £300 (basic) |
| Call recording | Included | +£125 | +£100 |
| Video conferencing | Included | +£150 | +£125 |
| Auto-attendant | Included | Included (most tiers) | +£50 |
| CRM integration | Included | Not available | +£75 (via partner) |
| Analytics | Included | +£75 | +£50 |
| Mobile app (full) | Included | +£100 | Included (most tiers) |
| Actual monthly total | £600 | £825 | £700 |
| Actual per user | £24 | £33 | £28 |
DialPhone at £24 all-inclusive is cheaper than BT at £33 and Gamma at £28 when you add the features every business actually needs.
The Honest Weaknesses
| Provider | Weakness | Impact |
|---|---|---|
| DialPhone | Smaller company, fewer brand recognition | Enterprise procurement teams may prefer bigger names |
| BT Cloud Voice | Slow support, complex pricing tiers | Real cost is 2x advertised base price |
| Gamma Horizon | Must go through reseller | Your experience depends on the reseller, not Gamma |
My Recommendation
Try all three. Get 2-week trials. Test call quality, mobile app, and support responsiveness yourself. The data will make the decision for you.
DialPhone — 30-day free trial. No credit card. No sales pressure. Compare it against BT and Gamma on your own terms.
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