A London 020 number that signals you belong in the capital — from the Square Mile to Croydon

London generates roughly a quarter of UK GDP and hosts more than 1 million registered businesses, from sole traders in Hackney to the European headquarters that cluster along Canary Wharf, the Square Mile and the King’s Cross tech corridor. A 020 number is the single clearest signal to UK customers that your company operates in the capital rather than further afield.

Whether you run an e-commerce brand from Shoreditch, a professional-services firm in Mayfair or a logistics operation near Heathrow, a 020 number ties your branding to London without you having to lease a central office. CallFactory delivers the number together with a full cloud phone system, so there is no on-site hardware to install and your existing handsets, mobiles and softphones keep working.

The 020 area code was introduced in 2000, when Ofcom merged the original 0171 (Inner London) and 0181 (Outer London) codes into a single Greater London range. Every London subscriber number then gained a leading 7 or 8, which is why so many existing London numbers still start 020 7 or 020 8 today. The 020 3 range was opened in 2005 once the older ranges filled up, and 020 4 followed in 2019 as demand kept growing.

The 020 area maps onto the Greater London telecoms region. That covers the 32 London boroughs plus the City of London, which means porting between providers is straightforward — any UK carrier that holds 020 stock can release a number to CallFactory through the standard gaining-provider-led process.

Area code 020 covers the whole of Greater London and the City. Major centres inside the area include:

• City of London — the Square Mile; banking, insurance and legal services
• Westminster — government, professional services, the West End retail core
• Camden — media, creative industries, King’s Cross-St Pancras
• Islington — Shoreditch fringe, professional services, fintech
• Hackney — Silicon Roundabout, tech scale-ups, creative studios
• Tower Hamlets — Canary Wharf financial district and East London tech
• Southwark — South Bank, More London, creative and hospitality
• Lambeth — Waterloo, Vauxhall, South Bank
• Wandsworth — Battersea Power Station, Nine Elms regeneration
• Hammersmith & Fulham — media clusters, Olympia, White City
• Kensington & Chelsea — luxury retail, high-end hospitality, fashion
• Ealing — west London film and television production
• Hounslow — Heathrow Airport and its commercial estates
• Hillingdon — Heathrow north, Brunel University, logistics
• Brent — Wembley, light manufacturing, professional services
• Barnet — north London business parks and independent trades
• Enfield — food and logistics along the A10 corridor
• Haringey — Tottenham, Harringay, independent retail and hospitality
• Waltham Forest — Walthamstow and Leyton, creative and construction
• Redbridge — Ilford, professional services, dentistry and legal
• Newham — Stratford, Olympic Park legacy, Queen Elizabeth Olympic Park
• Barking & Dagenham — east London logistics and automotive
• Havering — Romford, outer east London retail and trades
• Greenwich — O2, North Greenwich, maritime heritage
• Lewisham — south-east London services and hospitality
• Bexley — south-east outer London trades and distribution
• Bromley — south-east corporate offices and professional services
• Croydon — south London’s second major business district
• Sutton — south London professional and trades
• Merton — Wimbledon, legal and insurance
• Kingston upon Thames — south-west retail and universities
• Richmond upon Thames — west London creative and professional

If your business is registered at any Greater London postcode, you qualify for a 020 number.

London is broad, so a 020 number suits a wide mix of sectors. The three profiles we see most often at CallFactory are:

Financial and professional services — the City of London and Canary Wharf together form the largest financial centre in Europe. Law firms, accountants, insurance brokers, investment boutiques and B2B consultancies use a 020 number because their customers expect a capital-based line, which reduces friction in procurement and KYC checks.

Tech and creative scale-ups — King’s Cross, Shoreditch and White City host the biggest tech cluster outside Silicon Valley, alongside the UK’s film, advertising and fashion industries. A recognisable 020 number keeps a young company credible on pitch decks, press kits and Companies House filings, while the cloud platform lets a distributed team answer calls anywhere.

Tourism, retail and hospitality — with Heathrow, Gatwick and the West End drawing tens of millions of visitors each year, hotels, OTAs, ticket agents, restaurant groups and experience brands use the 020 as a mark of authenticity for both domestic and international customers.

Outside those three profiles a 020 still pays off. E-commerce brands, healthcare practices, trades and membership organisations across the capital all see the same local-trust benefit.

Google treats your business phone number as a geographic signal, which means a 020 number on your website, your Google Business Profile and UK business directories tells Google that your company belongs to London. Combined with a consistent NAP (Name, Address, Phone) profile across listings, that strengthens your ranking for searches such as “accountant London”, “osteopath Kensington” or “plumber Clapham”, and improves visibility on Google Maps.

Write the 020 number in the same format everywhere — same spacing, same separators — because Google only links citations together when they match. CallFactory uses the Ofcom-recommended format 020 XXXX XXXX, so you can copy it into every listing without introducing variations.

London-based online retailers frequently report a lift in phone enquiries once they display a 020 number alongside a mobile or 0800 line. A 020 reads as local and established, so customers hesitate less before dialling, which is especially valuable for higher-value purchases where a quick conversation closes the sale.

For professional services firms — legal, financial, creative, consulting — the 020 works as a trust marker on LinkedIn posts, email signatures and Google Ads. You can split inbound calls between the 020 and any other numbers you run, which lets you attribute leads to the marketing channel that generated the call.

If you already hold a 020 number with another UK provider, we can port it across at no cost. You keep the existing number and gain the CallFactory feature set — call queues, recording, analytics, IVR — on top of it. Porting itself takes up to five working days and we schedule the cut-over for a date that works for you, which keeps your line live until the moment the number transfers.

If you would rather pick a fresh, unused 020 number — perhaps one with a memorable digit pattern — the number picker at the top of this page shows live availability. We hold stock across the 020 3, 020 4, 020 7 and 020 8 ranges so you can choose whichever reads best for your brand.

Many London businesses run a 020 alongside another number. Common combinations include:

• 020 + 07 — the 020 on the website and in advertising, a 07 mobile for existing clients who want direct contact. Forwarding from the 020 to a mobile is included by default.
• 020 + 0333 — the 020 for local customers and a national 0333 number for UK-wide enquiries at standard geographic rates. Both lines land in the same call flow.
• 020 + 0800 — the 020 for general reachability and a 0800 freephone number for sales hotlines or campaigns, so callers dial at no cost while you cover the inbound minutes.

All combinations run on a single CallFactory account. Current rates for additional numbers are listed on the pricing page.

A London 020 number contains 11 digits in total: the area code 020 followed by an 8-digit subscriber number.

Standard format: 020 XXXX XXXX

Use the same format everywhere — your website, Google Business Profile, invoices and directories — because identical formatting is what allows search engines to tie your listings together.

The 020 number is part of your CallFactory business plan. There are no connection fees and no setup charges. The plan price depends on which features you activate — IVR, call queues, voicebots, call recording — and whether you pay monthly or annually, since the annual plan is cheaper per month. If you need several 020 numbers, for example one per branch or team, we add them to the same account.

All monthly contracts come with a one-month notice period. Every feature, plan and rate is listed on the pricing page.