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numbergroup
Membership

Move your phones to us. We'll save you money.

For just £149/month you get direct access to the UK wholesale telecom market — every number, every feature, every call at carrier cost.

Quick application form, then payment. 30-day no-questions refund.

Get the call rates your supplier pays.

Cut out the middleman. Save money with Membership. £149/month gives you direct access to the wholesale telecom market — every number, every feature, every call at carrier cost. Plus a team that picks up the phone when you need us.

Landline calls
0.3p/ min
Mobile calls
0.6p/ min

Wholesale call rates passed through with no markup, plus a small per-call connection charge. Full rate card →

Free phone numbers, every code, every type.

Pick as many as you need — 01, 02, 03, 0800, 0808 — from any UK area code. New ones provisioned instantly. Bringing existing numbers? We absorb BT's £2.49–£116 per-number transfer fee. No per-number rental. Ever.

Standard numbers
Free
Transfer-in
Free

Pick from any UK area — 0800, 03 or local. Browse numbers included with Membership →

Phones at supplier cost. No markup.

Grandstream IP deskphones at our distributor price — what we pay, you pay. Branded softphones for mobile and desktop from Acrobits at supplier cost — pay per active install, not per named seat.

Deskphones from
£28one-off
Softphones
~75pper install

Grandstream GXP1625 / GXP2135 / GXP2170. Pre-provisioned for you — plug into any Ethernet port on your broadband, plug in power, dial straight away. See the range →

SIP trunks for your own PBX. Included.

Already running 3CX, Asterisk, FreePBX, Cisco — or anything standards-compliant? Connect it to our trunks. No per-channel fee, no minimum commit. Calls land at the same carrier-cost rates above.

SIP channels
Free
Peak capacity
25lines

New to SIP? Read our plain-English SIP trunking guide →
Need more than 25 concurrent calls, or more than 75–100 numbers? Browse Members' numbers →

A full cloud phone system. Built in.

Don't want to run your own PBX? You don't need to. Membership includes a hosted cloud PBX — IVR menus, hunt groups, time-of-day routing, voicemail-to-email, call recording, virtual receptionists. Works from any office, home or mobile with an internet connection.

Smart features
All-in
Setup fee
Free

We configure it for how your business actually answers calls — not a template.

A team that knows your name.

Not a call centre. Not a ticket queue. A small UK team who know your business, your setup, and pick up when you ring. Same people every time. We'll happily get on a call and walk through anything — routing changes, a new starter, a weird voicemail you can't find.

Answer time
Seconds
Based in
UK

UK business hours, with out-of-hours cover for anything critical (phones down, routing broken).

What we believe

Once you're a Member, there's nothing left for us to sell you. Our job is to support you, not sell to you.

  • —
    No contracts. Trapping customers is what bad telecoms do.
  • —
    No per-number fees. Charging rent on a database row is dishonest.
  • —
    No marked-up call rates. We already make money on the Membership. The wholesale rate we pay is the rate you pay us.
  • —
    No bolt-ons. Every feature we build belongs to every Member.
  • —
    No portal you have to learn. You didn't go into business to learn telecom software. We configure things for you.
  • —
    Real humans answer the phone. Not a premium tier. The basic dignity of being a customer.
  • —
    No premium-rate numbers. 084, 085, 087, 09 and 118 numbers exist to extract money from callers. We haven't sold them since 2010. We only offer 01, 02, 03, 0800 and 0808 — better for the consumer dialling in, better for the business taking the call.
The only fee

Membership is the only thing we sell.

Every other telecom provider's business depends on marking up what they sell you — calls, numbers, voicemail licences, IVR add-ons, premium hardware. Every line item on your bill is a margin opportunity for them.

The Membership is our entire product. Calls, phones and features pass straight through to you at the supplier price we pay, with nothing added. There's nothing to upsell because there's nothing else to sell.

Best value today. Best value in five years. Best value as long as you're a Member.

Your monthly bill
Membership£149.00
Phone numbers (any quantity)Included
Voicemail, IVR, recording, routingIncluded
SIP trunks (any channels)Included
UK landline callsAt wholesale rate
UK mobile callsAt wholesale rate
Softphone installs~75p / active install
Grandstream hardwareAt distributor cost
Add-ons / feature licencesWe don't sell any
Every line at cost means the rates above can ever only move in your favour. When wholesale rates fall, your rates fall the same day.
Membership compounds

The longer you're a Member, the more it's worth.

Telecom contracts are designed to extract more from you over time. Mid-contract price rises. Automatic renewals at new tariffs. Fees that didn't exist when you signed up.

Membership runs the other way. Your £149 fee covers the relationship, and we'll always give existing Members twelve months' notice if we ever need to change it. The rates you pay for calls track our wholesale costs — they move down when costs fall, and we'll be honest if they ever need to move up. The phones we sell you get cheaper as the supplier updates them. Every new feature we build, you get free.

Five years in, you'll be paying the same Membership and getting more for it than you got on day one.

Staff on your side

We don't have a sales team.

When you call your current telecom provider, the person on the line has a script. Their job — whether they admit it or not — is to make sure you're paying for as many services as they can sell you, and to keep you on the line long enough that you don't leave.

The people who answer the phone here are the people who set up your account, transfer your numbers, fix your routing, and help your team configure their handsets. There's no commission, no quota, no “let me transfer you to retention”. The Membership is the whole product, so there's nothing to sell.

Same staff every time. Real names. UK phone numbers. We answer.

What our staff get paid to do
✓Set up your account and configure your routing
✓Transfer your numbers in from your old provider
✓Answer the phone when you call
✓Help you get more out of your Membership
✓Recommend the right handset for your team
✓Make sure your phones never stop ringing
What they don't get paid to do: upsell, cross-sell, transfer you to retention, push add-ons, or ask if you'd like to upgrade. None of those things exist.
Worked examples

What it looks like in real life.

Five typical businesses. What they pay at retail, what they pay on Membership, and what that adds up to over a year. Retail figures use current public competitor pricing; wholesale figures use the same wholesale rates published on our call rate card.

Business profile
Retail / month
Membership / month
Saved / year
Claims management

20-seat claims firm with FCA recording

20 softphones · 5 inbound 0800s · full call recording · 600 hours / mo

Retail
£2,935
/ month
Membership
£359
/ month
Saved / year
£30,900

Recording isn't a £15/mo feature licence here — it's just on. And the £2,400 in retail call charges is the structural gap.

Multi-branch trades

Plumbing business that switched from BT Business

12 local 01-numbers · 8 staff on softphones/mobiles · 200 hours / mo

Retail
£1,746
/ month
Membership
£225
/ month
Saved / year
£18,300

Numbers cost £0. Want a 13th area code tomorrow? Still £0. Per-line rental at £10.52/mo — on a 60-month Cloud Voice Basic licence that rises £1 every April — is the markup BT Business quietly takes.

Growing SaaS

30-person remote team that switched from RingCentral

30 remote softphones · 1 main 0800 · no SIP trunks · 600 hours / mo

Retail
£640
/ month
Membership
£347
/ month
Saved / year
£3,500

Same softphones, same features. Then RingCentral grows by £18 every hire — we grow by 75p.

SIP trunk customer

Contact centre running their own 3CX PBX

30-channel SIP trunk · 50 agents · 4,400 hours / mo (mostly UK mobile)

Retail
£28,360
/ month
Membership
£1,489
/ month
Saved / year
£322,400

Call cost is the entire telecom budget at this volume. Wholesale vs retail is a 20× gap — and it's structural.

Estate / lettings

8-branch estate agency, mobile-led team

8 local 01-numbers · 1 memorable 0800 · 15 staff on softphones · 225 hours / mo

Retail
£1,973
/ month
Membership
£240
/ month
Saved / year
£20,800

Open a 9th branch? Number is free. Add the boss's PA on a softphone? 75p. The retail bill grows with the business — ours doesn't.

Who Membership is right for

Membership pays back in the first bill if any of these apply.

The maths above is illustrative. Here's the practical shorthand — if you can tick any one of these today, the relevant Membership fee is already covered before we count anything else:

  • You spend more than ~£150/month on call charges today
  • You pay for more than 3 phone numbers or lines
  • You're on a per-seat softphone or UC plan (RingCentral, 8x8, Vonage, etc.) with 5+ users
  • You run a SIP trunk with 5+ channels
  • You pay extra for call recording, IVR, voicemail menus, or softphones beyond a basic plan
  • You're transferring numbers in or out frequently
  • You're paying for “premium” or out-of-hours support

If none of those apply— for instance, you're a sole trader with a single number and you make under an hour of calls a month — Membership probably isn't right for you yet. Buy a memorable number outright if you want one, and come back when you've grown. We'd rather lose your signup today than have you on a Membership that doesn't pay for itself.

What we're upfront about

Member-grade disclosure, all the limits in plain English.

Members aren't customers — they're owed full disclosure. Here's every operational limit, caveat, and edge-case we know of, written the way we'd want it written if we were the ones paying.

  • With one number per user and typical number and feature add-ons, Membership starts paying off around 6 users before call charges. With one shared number, the £15/user benchmark plus £13 in number and feature charges crosses over at 10 users before call charges. Multiple numbers, SIP trunks or hardware can change the comparison. If you're a 1-2 person business with one mobile and a single 0800, basic per-user VoIP at £15/user/month will be cheaper than us — come back when you've grown or your needs are more complex.
  • £149/month is the only price — no annual discount, no tiered plans, no enterprise upgrade. Membership covers up to 25 phone lines; bigger requirements get a chat about how we set you up.
  • Paid by Direct Debit (first month via Stripe, then DD takes over from month two)
  • Handsets are Grandstream only — if you want Yealink, Cisco, or another brand, buy them elsewhere and we'll provision them
  • Expensive call destinations blocked by default — we protect Members from accidental bill shock; ask if you have specific needs
  • A security deposit may be required depending on company status, accounts, or expected call volume — standard wholesale-industry practice
  • Per-active-install softphone billing — no named-user seat licences to manage; you only pay for installs actually in use
  • Support is UK business hours, plus emergency out-of-hours cover for anything critical (phones down, routing broken, emergency call diversions). Not 24/7 follow-the-sun.
  • Transferring out of NumberGroup-allocated numbers: £125 admin fee covers our genuine cost handling the regulated paperwork. Numbers you brought in transfer out free.
  • If you stop being a Member, NumberGroup-allocated numbers return to our inventory. Numbers you brought in stay yours and transfer to wherever you go next.
Bring your existing numbers free

Keep your numbers. Lose the line rental.

Every UK phone number you currently rent — 01, 02, 03, 0800, 0808 — can transfer to your Membership at no charge. Bring one, bring fifty. Every line rental you're paying right now disappears once we've completed the transfer.

You don't have to risk anything. Numbers stay live with your current provider throughout. The switch happens automatically once it's complete, and you do nothing on the day — calls just start arriving at your new Membership routing.

Start the transfer →
Two minutes. List your numbers, sign the one-page authorisation, we do the rest.
How transferring numbers works

UK number transfers are gaining-provider-led— we (NumberGroup) drive the process with your old provider on your behalf, whether that's your existing supplier, their carrier, or a chain of resellers in between. You sign a one-page authorisation form, we handle BT, Ofcom, and the cut-over. Your existing service keeps running the entire time. The number switches over at an agreed time window, usually first thing in the morning, with zero downtime for inbound callers.

  1. 1
    Send us your list of numbers
    DDIs, landlines, freephones, fax lines, ISDN channels — whatever you currently pay for. CSV, spreadsheet, screenshot, photo of an old phone bill. No special format needed.
  2. 2
    We send you a one-page authorisation
    Your old provider needs written authorisation to release the numbers. We pre-fill it with your numbers and details, you sign electronically. Takes 60 seconds.
  3. 3
    We file the regulated request via BT Wholesale
    As an Ofcom-licensed UK carrier (CUPID 802) we file directly with BT Wholesale. BT charges us £2.49–£116 per number; we absorb the fee. Standard window: 5–10 working days, occasionally faster.
  4. 4
    Your old provider must release under Ofcom rules
    They have a legal obligation to action the transfer. They can't 'lose' your numbers, refuse without a documented reason, or charge an exit fee to a UK business beyond their published terms.
  5. 5
    Your numbers stay live throughout the window
    Calls keep arriving on your existing provider's network. Customers, suppliers, your team — nobody notices anything is happening. We agree a cut-over time with you 48 hours before the move.
  6. 6
    Cut-over, then we ring you within minutes
    At the agreed time (usually 07:00 or 08:00 to minimise impact) calls start arriving at NumberGroup. The UK team rings you to confirm everything works end-to-end before signing off. Old provider's bill stops on the cut-over date.
What if my current provider blocks the transfer?
Ofcom rules prohibit it without a specific documented reason (e.g. an unpaid final bill, address mismatch, or the number is on a sub-account with a different bill payer). If it happens, our transfer team takes it on — we deal with their team directly so you don't have to. Vast majority of transfers complete first time. The few that need follow-up usually clear within a few days.
Zero-downtime guarantee
Your existing numbers keep ringing on your existing provider's network until the moment of cut-over. Cut-over itself is a sub-second switch on BT's network. No missed calls, no "please call us back" voicemail, no service gap. We confirm by ringing you on the ported number ourselves before declaring the transfer complete.
What about my existing PBX / phone system?
Most number transfers happen while the customer keeps their existing phone system. We deliver calls into the system the same way the old provider did — SIP trunk, divert to a landline, whatever you have. If you want to move PBX too we can do it in the same window or as a separate later phase. Common Member sequence: transfer numbers first, sort out new PBX / desk phones later when there's no time pressure.
How calls reach you

Four ways to take calls. Pick whichever suits how you already work.

Most Members start with the first option because it changes nothing about their existing setup. The other three are options you grow into when you want to — or never, if you don't.

  1. 1

    Divert to your existing landline or mobile

    Most common

    Keep your phones, keep your existing provider, change nothing. We point your NumberGroup numbers at the lines you already have. Calls forward at our wholesale rate — about 0.31p per minute to a UK landline, about 0.64p per minute to a UK mobile. Cheapest way to get started.

  2. 2

    SIP delivery to your own kit

    Free per-call

    Got a PBX of your own (3CX, FreePBX, Asterisk, anything standards-compliant)? We deliver calls straight to it over SIP. No per-minute charge for the B-leg, ever. You manage your phones, we handle the numbers and the network.

  3. 3

    Grandstream IP desk phones from us

    Free per-call

    Buy desk phones at the supplier price we pay (£28–£83 ex VAT). They plug into your office network and ring directly via SIP — no per-call charge, no per-handset rental, no extension fee. Most office Members use these. Models below in the Hardware section.

  4. 4

    Luna softphone (iOS, Android, desktop)

    ~75p per active install per month

    NumberGroup-branded softphone app for people who need to take business calls on their mobile or laptop. Around 75p per active install per month at our wholesale Acrobits cost — pay only for the seats that genuinely need it, not your whole team. Optional, never required.

Every feature, included

The features other providers sell as bolt-ons. We just give them to Members.

Call routing

Send each number to the right team, phone, or person — and reroute instantly when things change.

Time-of-day routing

Different routing in business hours, after hours, weekends, bank holidays. We set it up once, it just works.

IVR menus

“Press 1 for sales, 2 for support.” Build it with us in plain English on a phone call — no portal.

Call queues

When everyone's busy, callers hold with a position announcement instead of getting voicemail or a busy tone.

Hunt groups

Ring a whole team at once, or one after the other. Reorder the rota any time, free.

Voicemail to email

Missed calls become emails — caller number, time, audio file, transcription. Read it on your phone in the meeting.

Call recording

Every inbound call, optionally outbound, stored and searchable. For training, compliance, or just remembering what was said.

Missed call alerts

If a call rings out, we email the recipient and any backup so nothing falls through the cracks.

Call whisper

Tell the answerer where the call came from before they pick up. “Sales line — Yellow Pages ad.”

Softphone apps

Luna, our branded mobile and desktop softphone, lets your team take business calls anywhere on iOS, Android, Windows and Mac. Around 75p per active install per month at our supplier's cost — pay only for the people who actually need it, billed by install rather than by seat.

SIP credentials

Plug your existing IP phone, PBX, or hosted system into our network. We support every standards-compliant device.

Call reporting

Inbound and outbound CDRs, downloadable, integrate with your CRM. See which campaigns are actually driving calls.

Need something not on this list? We're a UK telecom carrier with the full set of services to draw on. Ask us — there's no licence fee to add it to your Membership.

Members-only hardware

Phones at our supplier cost. No handset margin, ever.

Members can buy Grandstream IP phones from us at the price we pay the wholesaler. Three models cover most setups — entry, mid, and executive. Pre-provisioned before they ship — plug into any Ethernet port on your broadband router, plug in the power, and the phone registers itself. No setup, no web UI, no IT person required.

Grandstream GXP1625
2-line entry

Grandstream GXP1625

Two SIP accounts, HD audio, dual-port POE switch. The everyday business phone — quick to set up, easy to use, hard to break.

£28ex VAT
£33 inc VAT · one-off, no rental
Grandstream GXP2135
4-line mid-range

Grandstream GXP2135

Four SIP accounts, 8 line keys, Bluetooth handset, EHS headset port. The right phone for a reception desk or sales hand who lives on calls.

£64ex VAT
£81 inc VAT · one-off, no rental
Grandstream GXP2170
12-line executive

Grandstream GXP2170

Colour 4.3″ display, 12 lines, integrated Bluetooth, web programmable keys, EHS support. The flagship — for directors, MDs and anyone who wants the best phone on the desk.

£83ex VAT
£111 inc VAT · one-off, no rental

Need switches, wireless access points, video phones, or a specific Grandstream model not shown? We stock the full range at supplier cost — Members just ask.

How to join

One application. One conversation. Then we get on with it.

We'll talk through what you currently have, what you need, which numbers you want to bring with you. Set you up within the hour for most accounts. The next bill you get is from us. The one after that is the same.

Become a Member · £149/month

30-day no-questions refund. Pay by card now, Direct Debit takes over after onboarding.

Included with Membership

Browse the numbers you can pick from.

Every UK area code, 0800, 0808 and 03 numbers — all included with your £149/month. Pick what you want when you join, swap them later, add more whenever you need. No per-number fees.

See Members' numbers →

NumberGroup is the trading name of Datazero Ltd, a UK telecom carrier regulated by Ofcom. Our number ranges were allocated directly to us by Ofcom in 2010. CUPID 802.

Frequently asked questions

  • How much is NumberGroup Membership?

    Membership costs £149/month. It includes unlimited standard UK numbers and the NumberGroup platform. Calls are billed separately at carrier cost, with no markup.

  • Are memorable numbers included with Membership?

    Standard numbers are included. Memorable numbers are bought separately for a one-off price and are yours to keep.

  • Can I bring my existing business numbers?

    Yes. You can transfer your existing UK business numbers to NumberGroup. Number transfer is included with Membership, and our team handles the process.

  • How many phone lines are included?

    Membership includes up to 25 concurrent calls. If your business needs more capacity, speak to our team about your requirements.