0800 Numbers Explained — Everything You Need To Know

We've been selling UK 0800 numbers to businesses since 2010 and were one of the first UK cloud telecom companies to take allocations directly from Ofcom when blocks were made available. Over that time we've answered the same questions about 0800 numbers thousands of times — usually from a business owner trying to work out whether the "cheap" rental price they were quoted is going to bite them on the redirect minutes.

This is the answer to every question we get asked about 0800 numbers, in one place, updated for 2026. It applies to every UK business — startup, SME, or large — and is written by a licensed UK telecom carrier (us, Datazero Ltd trading as NumberGroup, Ofcom CUPID 802).

What is an 0800 number?

An 0800 number is a UK non-geographic phone number where thereceiver— the business — pays for the call, not the caller. They're commonly known as freephone numbers because the person dialling them rings in free of charge.

0800 is the only true UK freephone prefix still in active use. 0808 numbers are also free for the caller (these tend to be used by charities, helplines and government services), and historic ranges like 0500 were withdrawn by Ofcom in 2017. If you see a UK number starting 084, 087 or 09, that is not free — those are revenue-share "business rate" or premium-rate numbers and the caller pays.

How much do 0800 numbers cost?

This is the question that catches most businesses out, because the headline rental price is rarely what you end up paying. The real cost of an 0800 number breaks down into three parts:

• Rental / standing charge — what you pay each month just to hold the number.
• Redirect charge per minute — what your provider charges to route the call to your actual phone (a landline, mobile, or SIP trunk).
• Mobile access charge (MAC) pass-through — some providers also pass on the regulated mobile origination charge on calls that started on a UK mobile network.

The reason headline prices vary so much is that providers shuffle these costs around. Cheap rental usually means expensive per-minute redirect, and vice versa. To genuinely compare two quotes you need to model your expected call volume — at 200 minutes a month vs 2,000 a month, the cheaper provider can flip.

What does an 0800 number cost from NumberGroup?

With NumberGroup Membership at £149/month flat, you get:

• 0800 number rental: Free. Standard 0800 numbers (and 0808, 03, all UK area codes) are included with Membership. No per-line rental, no per-number rental.
• Per-minute redirect: Wholesale, passed through. Around 0.3p/min to UK landlines, 0.6p/min to UK mobiles (rounded, includes the connection charge). The actual rates live on the wholesale call rate card.
• Smart features: Free. IVR menus, voicemail-to-email, call recording, hunt groups, time-of-day routing — all included, no bolt-ons.

On a typical SME profile — say 600 inbound minutes a month split 70/30 landline/mobile — that's roughly £2.34 in calls on top of your £149 Membership. There's no per-channel licence and no minimum-commit contract.

Memorable 0800 numbers (e.g. 0800 100 100, 0800 11 22 33, vanity numbers like 0800 NUMBERGROUP) sit on a higher Ofcom rate band and are sold as one-off outright purchases. Browse the memorable 0800 inventory to see live prices.

How to get an 0800 number for your business

0800 number ranges are allocated by Ofcom only to licensed UK telecom carriers. Around 20 companies turn up on Google when you search "buy 0800 number" — but most of them aren't carriers. They're middlemen reselling on top of a wholesale supplier you've never heard of.

That matters because:

• A reseller can disappear (or have their wholesale supply cut off in a contract dispute), and your number goes with it.
• When you want to port your number to a new provider — your legal right under General Conditions — a reseller chain makes it slower and harder. Sometimes much harder.
• The reseller has no influence over outages or routing issues. They open a ticket like you would.

You can check who actually holds a UK number range on Ofcom's public Numbering Plan. Buy from a carrier — that's the test. Datazero Ltd t/a NumberGroup holds 0800 ranges directly. So do BT, Gamma, Vonage Business, Voxbone and a handful of others.

With us, the path is simple:

• Join Membership (£149/mo, no contract).
• Pick any 0800 from the Members-included inventory or buy a memorable 0800 outright.
• Tell us where to route it (a landline, a mobile, a SIP trunk, an IVR menu) and we set it live.
• If you already own an 0800 with another provider, we'll port it in for free.

What does it cost to call an 0800 from a landline?

Nothing. Calls to 0800 numbers from UK landlines are free for the caller — and have been since 1985, when BT first introduced the "Freefone" service. The business receiving the call pays the inbound termination charge.

What does it cost to call an 0800 from a mobile?

Since 1 July 2015, calls to 0800 numbers from UK mobiles are free for the caller too. This applies to every UK mobile network — EE, Vodafone, O2, Three, BT Mobile, and every MVNO running on top of them. If your mobile bill shows a charge for an 0800 call, that's a billing error and your provider owes you a refund.

The change was part of Ofcom's 2015 UK Calling reforms, which simplified non-geographic call charging and made the cost of 084, 087 and 09 calls more transparent (split into "access charge" and "service charge").

Why should I get an 0800 number?

Three commercial reasons most businesses adopt 0800:

Conversion uplift on inbound enquiries. Repeated industry studies have shown 0800 numbers are recognised as consumer-friendly. People who would hesitate over an unknown geographic number will ring an 0800 because they know it's free. If your phone is a sales channel — and for most UK SMEs it still is — that's a measurable uplift on cost-per-acquisition.

National presence without renting an office. An 0800 is non-geographic, so it doesn't telegraph "small business in one town." If you trade online, sell into the whole of the UK, or have customers who think a local landline means a local supplier, an 0800 levels the playing field.

Flexibility. The number isn't tied to a physical line. You can move offices, switch from a desk phone to a softphone, send the calls to a mobile while you're away, or split them across a team by time-of-day rules. None of that requires a new number.

The honest counterpoint: 0800 isn't always the right answer. If you're a 1-2 person micro-business with very low inbound call volume, basic per-user VoIP from a mobile app may serve you better — we'll happily tell you that directly. If you serve a tightly local market (a single trade catchment area in one town), a local 01/02 number can outperform an 0800 because it signals "we're your neighbour."

How to call an 0800 number from abroad

You can call a UK 0800 number from anywhere in the world. The dial format is the same as any UK number — drop the leading 0 and prefix with the UK country code:

• +44 800 310 1010 (from any country, using +)
• 00 44 800 310 1010 (if your network uses 00 instead of +)

One thing to be clear about: the free-to-call rule only applies to UK callers. If you ring a UK 0800 from a French landline or an American mobile, your provider will bill you at their international rate. The business receiving the call doesn't pay for international legs.

How to set up an 0800 number

With NumberGroup, the setup is two steps:

• 1. Allocate the number. From the portal, pick or port your 0800 and assign it to your account.
• 2. Route it. Send calls to any destination — a UK landline, a mobile, a SIP trunk, an IVR menu, a hunt group, or a voicemail-to-email box. You can stack rules (time-of-day, working-hours-only, hunt with mobile fallback) without touching the rest of your setup.

For a full cloud phone system — hosted PBX with smart features included with Membership — we'll configure the routing for how your business actually answers calls. Not a template, and not a sales call to upgrade to an "enhanced" plan.

How 0800 numbers actually work

Behind the scenes, an 0800 number is a translation layer. When someone dials 0800 310 1010, the telephone network doesn't physically "ring a phone at 0800 310 1010" — there's no phone there. Instead, the network looks up which carrier holds that range, hands the call to that carrier, and the carrier translates the 0800 to a real destination (a SIP endpoint, a PSTN number, an IVR app) using the routing rules the business has set up.

That's why 0800 numbers are so flexible. The destination isn't baked into the number — it's a soft configuration you can change in seconds. It's also why failover routing is genuinely useful: if your office trunk goes offline, the lookup can redirect the call to a mobile or a voicemail-to-email box without the caller noticing. Traditional copper landlines can't do that.

Memorable 0800 numbers

Some 0800 numbers are easier to remember than others. Triple digits, repeating patterns, mnemonics that spell words on a keypad — these sit on Ofcom's higher rate bands and command a premium because they're finite and most have already been allocated.

With us, memorable 0800 numbers are sold as outright purchases, not rentals. You pay once, the number is yours to keep, and you can take it with you if you ever leave. Browse live inventory on the 0800 search page — every number has the price visible, no quote-on-request nonsense.

A short history of 0800 numbers

BT launched the UK's first dedicated freephone service — "Linkline" — on 12 November 1985, with 0800 as the direct-dial prefix. Before that, freephone calls were placed by ringing the operator and asking for a company by name (the "Freefone" service that ran from the 1960s).

Through the late 1980s and 1990s, other UK telecom operators launched competing freephone ranges — 0500 (Mercury), 0321 and 0958. Eventually 0800 became the recognised standard and the others fell out of use. Ofcom formally withdrew the 0500 range in June 2017.

The 2015 UK Calling reforms made 0800 calls free from mobiles for the first time, which is what made them the powerful sales-and-marketing tool they are today. Before that, callers on a mobile were charged 14–40p/min depending on network and many would simply not ring 0800 numbers from their phones.

Ofcom continues to release new 0800 ranges as old ones fill up. NumberGroup takes new ranges directly at allocation — so when you buy from us, the number genuinely lives on our network.