Network & carriers
The UK's numbering plan is regulated by Ofcom, with London using a single 020 area code shared across the entire city rather than separate codes per borough.
+44 · GB · UTC+0
United Kingdom
Country Code & Virtual Numbers
The UK's +44 code covers a numbering plan regulated by Ofcom and shaped by two big renumberings — PhONEday in 1995 and the Big Number Change in 2000 that gave London its single 020 code. Capital: London · Business hours: 4:00 AM–12:00 PM EST.
// The Basics
What is the +44 country code?
Numbering in United Kingdom is administered by Office of Communications (Ofcom).
Numbering format
UK numbers drop the leading 0 when dialing from abroad — a London number written domestically as 020 7946 0958 becomes +44 20 7946 0958 internationally.
Calling culture
British business culture favors scheduled calls over cold-calling — sending a calendar invite or a short email ahead of time is standard practice.
Did you know
Since 29 January 2025, UK phone companies must block calls from abroad that falsely display a UK landline number — a measure Ofcom introduced against caller-ID spoofing.
// Quick Facts
A quick read on United Kingdom numbers.
UK numbers are 10 digits after +44 in almost every case: mobiles start with 7, and landline area codes vary in length — 20 for London, 121 for Birmingham, 161 for Manchester.
From the US: 011 44 20 XXXX XXXX
// Reference
Dialing +44: numbers, codes and rules
- Trunk prefix
- 0 — used domestically, dropped after the country code.
- Number length
- 10 digits for mobiles and nearly all landlines (a few numbers have 9)
- Mobile numbers
- 10 digits starting 71–75 or 77–79 (e.g. +44 7XXX XXXXXX; domestically 07XXX XXXXXX)
- Landlines
- Numbers begin 01 or 02 domestically; area codes vary in length (e.g. 20 London): +44 20 XXXX XXXX
- Major area codes
- London 20
- Birmingham 121
- Manchester 161
- Glasgow 141
- Edinburgh 131
- Cardiff 29
- Dialing in
- From the US: 011 44 20 XXXX XXXX
- Dialing out
- 00 is the international prefix from United Kingdom.
- Useful numbers
- Emergency: 999
- Emergency (also works): 112
- Freephone prefix: 080 (e.g. 0800, 0808)
- Regulator
- Office of Communications (Ofcom)
- Time zone
- GMT (UTC+0); BST (UTC+1) in summer
- Daylight saving
- Clocks go forward at 1am on the last Sunday of March and back at 2am on the last Sunday of October.
- Working week
- Monday–Friday; weekend: Saturday–Sunday
- Since 29 January 2025 UK phone companies must block calls from abroad that falsely display a UK landline number.
- London has used the single 020 area code since the 2000 Big Number Change; PhONEday in 1995 added the '1' to most other area codes.
- Bank holidays differ between England and Wales, Scotland and Northern Ireland.
Reported scam patterns
- Ofcom warns that scammers spoof caller ID to show a genuine UK number, and now requires providers to block calls from abroad falsely showing UK landline numbers. source
Sources
- Ofcom National Telephone Numbering Plan (April 2025)
- ITU E.164 numbering plan for the United Kingdom (Ofcom communication of 13.I.2025)
- GOV.UK bank holidays
- GOV.UK: when do the clocks change
- Ofcom: new blocking requirements for scam calls from abroad
- Wikipedia: Telephone numbers in the United Kingdom (pointer for PhONEday/Big Number Change history and 9-digit numbers)
Best time to call United Kingdom from the US
United Kingdom is on UTC+0 · Business hours = – EST · Mon–Fri
// Why a Virtual Number
Why get a United Kingdom virtual number?
A +44 virtual number gives your business instant local presence in United Kingdom — without the overhead.
Local caller ID in United Kingdom
When you call from your virtual United Kingdom number, contacts see a local +44 number — dramatically improving answer rates.
No office needed
Establish a local presence in United Kingdom without renting space, hiring locally, or installing any hardware.
Instant credibility
UK consumers and businesses are notably wary of unfamiliar international numbers — a local 020 or regional code signals you're a known quantity.
Routes to any device
Calls to your United Kingdom number ring your team on mobile, desktop, or desk phone — wherever they work.
Free tools
Look up a number from United Kingdom
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Frequently Asked
United Kingdom questions answered.
Answers about Ofcom's numbering rules, London's shared 020 code, and getting a local UK virtual number.
Dial 011 (the US exit code), then 44, then the national number, leaving out the leading 0 used for domestic calls. Number length: 10 digits for mobiles and nearly all landlines (a few numbers have 9).
Start calling United Kingdom, not tomorrow.
Get a virtual United Kingdom number or make direct international calls to +44 — active in under ten minutes.