Telephone Numbers & NGNs

What is an NGN number?

A non-geographic number or NGN is a telephone number that isn’t tied to a physical location. Rather than being tied to a specific geographic area code or exchange, an NGN can be routed to landlines, mobiles, SIP services or multiple destinations. Call costs are set by the prefix you choose (0800, 03, 084x, and so on), not by where the call actually ends up.

That flexibility is why NGNs are so widely used by growing businesses. You get a number, or a small set of numbers, that project a national presence, work identically whether your team is in one office or spread across the country, and don’t need to change if you move premises, add a location, or switch to hybrid working.

CloudClevr provides both on-network and on-site NGN solutions for UK businesses. Because we handle high volumes of number provisioning across multiple carriers, we’re able to offer genuinely competitive pricing, alongside the expertise to help you choose the right type of number for how your business actually operates, not just the cheapest option on a price list.

The main types of NGN, and what each one is actually for

0800 and 0808 (Freephone). Free for the person calling, chargeable to you as the number owner. The obvious use case is anything customer-facing where you want to remove all friction from getting in touch: sales enquiries, support lines, anywhere a caller might hesitate if a call is going to cost them money.

03 numbers. Introduced in 2007, and charged to the caller at the same rate as a standard 01 or 02 landline call, including all mobile and landline bundles. You still pay to host the number, but your customers pay nothing extra to reach you, which makes 03 a strong middle ground: a genuine national number, without the mobile-calling premium that comes with some 08-prefixed numbers.

Chargeable 08 numbers (0844, 0843, 0871, 0872). Calls to 084 and 087 numbers include an Access Charge set by the caller’s phone provider plus a Service Charge set by the number range. Depending on the number used, the Service Charge can range up to 7p or 13p per minute.

01/02 numbers. These give the impression of a local presence in any UK town or city, and can be pointed to any landline or mobile you choose. Useful if you want to appear rooted in a particular region, even if your team isn’t physically based there.

Whichever type you choose, the same network features are available on top: auto attendant, call recording, call queuing, and routing by time of day, geography, or team availability. Because these run on the network rather than on-site, you don’t usually need to invest in extra hardware or additional lines to get them.

Do I need a physical line for an NGN number?

No. NGNs are virtual by design. When someone calls your number, the network handles the routing to wherever you’ve told it to send the call, whether that’s a desk phone, a mobile, or a cloud-based call handling platform. This is also why NGNs sit well alongside a SIP-based phone system: the number and the underlying connectivity are separate, so you can change how calls are handled without ever having to change the number your customers know.

Can I keep my NGN number if I switch provider?

Generally, yes. NGNs are portable between providers. The process and timeline vary depending on the number range and your current provider, so it’s worth checking the specifics for your exact number before you commit to switching.

How much does an NGN number cost?

Cost depends on the type of number and the call volumes you’re expecting. 0800 and 0808 numbers cost the business the most per minute since the caller pays nothing, 03 numbers sit in the middle, and 01/02 numbers are typically the most cost-effective option if a local-presence number is all you need. Because we manage high NGN volumes across multiple carriers, we’re usually able to offer more competitive rates than going direct, particularly for businesses that need several numbers across different regions or departments.

Choosing the right number for your business

The right choice depends on your caller profile more than anything else. If you’re removing friction for cost-sensitive customers, 0800 wins. If you want a genuine national number without the mobile premium, 03. If local credibility matters more than national reach, 01/02. Most businesses end up running a small combination rather than a single number, one for sales, one for support, one for a specific region or campaign.

If you need help to work out which number, or combination of numbers, actually fits how your business operates, get in touch with us!