Seat-priced phone system · United Kingdom

UK Business Phone System Prices for 5–9 Seats (2026): £5–£25 per Seat

At 5 seats, the 16 published plans we hold run from £5.00 to £25.00 per seat per month over three years.

The lowest is Voipfone Voipfone 100 (Business) at £5.00, published at £5.00 on monthly billing.

At this size, in order

Every plan we hold that a 5-seat business could buy, ordered by effective cost per seat over three years. Ties are broken by the published seat price, then alphabetically. Nothing else affects the order, and no position on this page is for sale. 16 plans, checked 2026-09-06.
Provider and plan	Published seat price	On	Min seats	Effective / seat at 5	3-year cost for 5 seats
Voipfone Voipfone 100 (Business)	£5.00 ex VAT	monthly billing	1	£5.00	£900
bOnline Starter	£7.00 ex VAT	annual billing	—	£7.00	£1,260
RingCentral (RingEX) Essentials	£12.99 VAT basis not stated	annual billing	—	£7.99	£1,438
Voipfone Voipfone 500 (Business)	£10.00 ex VAT	monthly billing	1	£10.00	£1,800
Vonage (Vonage Business Communications) Express	£10.00 ex VAT	monthly billing	—	£10.00	£1,800
Dialpad Standard	£12.00 VAT basis not stated	annual billing	—	£12.00	£2,160
bOnline Unlimited Calling	£13.95 ex VAT	annual billing	—	£13.95	£2,511
RingCentral (RingEX) Standard	£19.99 VAT basis not stated	annual billing	—	£14.99	£2,698
Voipfone Voipfone 1000 (Business)	£15.00 ex VAT	monthly billing	1	£15.00	£2,700
Vonage (Vonage Business Communications) Core	£15.00 ex VAT	monthly billing	—	£15.00	£2,700
bOnline AI For Business Calls	£19.95 ex VAT	annual billing	—	£19.95	£3,591
RingCentral (RingEX) Premium	£24.99 VAT basis not stated	annual billing	—	£19.99	£3,598
Dialpad Pro	£20.00 VAT basis not stated	annual billing	—	£20.00	£3,600
Voipfone Voipfone Unlimited (Business)	£20.00 ex VAT	monthly billing	1	£20.00	£3,600
RingCentral (RingEX) Ultimate	£29.99 VAT basis not stated	annual billing	—	£24.99	£4,498
Vonage (Vonage Business Communications) Max	£25.00 ex VAT	monthly billing	—	£25.00	£4,500

UK providers do not publish on the same basis. Figures here are exactly as published; where the provider states the basis we print it. At 20% VAT an ex-VAT figure is 1.2 times higher on the invoice, so an ex-VAT price and an inc-VAT price are not comparable as printed. We do not convert between them.

Scroll sideways on a phone.

How that is worked out

seats billed = max(seats you have, minimum seats the plan requires) plan per month = published seat price x seats billed three-year cost = plan per month x 36 + setup fee effective per seat = three-year cost / (36 x seats you have) monthly-billing gap = monthly-billing price / annual-billing price flat package = flat monthly price + (seats billed - users included) x additional-user price add-on plans = shown on the provider's page, never ranked (they are not a phone system on their own) calls not included = shown on the provider's page, never ranked (calls are billed per minute, or sold as separate call packages, on top of the seat price) plan at each size = the cheapest plan that covers that seat count; a plan with a user cap hands over to the next one

Nothing else is added. Taxes, regulatory recovery fees, USF and e911 charges are not added to any figure on this site. On taxes and regulatory fees, 2 of the 37 providers state that the price already carries them on at least one plan, 0 publish what they come to, 14 say they are extra without an amount, and 21 say nothing. Where a provider says the price is all-inclusive or includes them, the page says so beside the figure; everywhere else the invoice will be higher than the figure. Where a plan needs another subscription first (a Google Workspace or Microsoft Teams license), that subscription is not in the figure and the page says so. Handset purchases, number porting, international calling and overage are excluded. Every figure here is a floor. The full method is at Method.

Where the answer changes

If you will not sign for a year, the order changes. Dialpad charges 1.83 times its advertised rate on monthly billing.
Taxes and fees are not the same across this table. 16 say nothing on the pricing page, which does not mean there are none. Only the first group is close to the invoice.
If none of these fits, do not force it. The full list carries every provider we hold, including the ones that publish no price at all.

Who this is not for

This is not a list of the best phone systems. It is every plan we hold that a business of this size could buy, in price order. We have not used these products and we do not rate them.

Sources

Voipfone pricing page. checked 2026-09-05
bOnline pricing page. checked 2026-09-05
RingCentral (RingEX) pricing page. checked 2026-09-05
Vonage (Vonage Business Communications) pricing page. checked 2026-09-05
Dialpad pricing page. checked 2026-09-05

Written by Kaz (pen name). Figures are copied from providers' published pricing pages on the dates shown. We have not used these products. Corrections: contact form.