United Kingdom Calling Code
United Kingdom of Great Britain and Northern Ireland
- Last reviewed
- Last reviewed:
- Reviewed by
- Reviewed by countrycalling.codes editorial team
Key Facts
- International Calling Code
- +44
- Country Name
- United Kingdom
- Official Name
- United Kingdom of Great Britain and Northern Ireland
- Capital City
- London
- Region
- Europe
- Subregion
- Northern Europe
- ISO 3166-1 Alpha-2
- GB
- ISO 3166-1 Alpha-3
- GBR
- Trunk Prefix
- 0
- International Exit Prefix
- 00
How to Dial United Kingdom
Saving the number in contacts
Start with +44, then use the reviewed national significant number. Remove the national prefix 0 before adding +44. The 0 is not part of the national significant number in international format.
Calling from abroad
On a mobile, use the + form. If a network requires digits instead, replace + with that origin network's international prefix. United Kingdom's own standard exit prefix for outbound calls is 00.
Trunk prefix 0 is dropped when dialing internationally.
Calling a United Kingdom mobile
Remove the first 0 from 07700, then add +44.
- Domestic display
- 07700 900XXX
- International display
- +44 7700 900XXX
- +44Country code: United Kingdom
- 7700Mobile range: Example mobile prefix without the trunk 0
- 900XXXSubscriber digits: Placeholder digits
Calling a United Kingdom landline
Remove the first 0 from 020, then add +44.
- Domestic display
- 020 7946 XXXX
- International display
- +44 20 7946 XXXX
- +44Country code: United Kingdom
- 20Area code: London code without the trunk 0
- 7946 XXXXSubscriber number: Placeholder digits
Exceptions and Routing Notes
Common United Kingdom Formatting Mistakes
- Keeping the domestic 0 and producing +44 020… instead of +44 20…
- Dialling 00 44 and also retaining the plus sign.
- Treating 070 personal numbers as ordinary mobile numbers.
Number Portability and Carrier Data
Mobile number portability means a prefix may not identify the current carrier. Treat carrier data as a timestamped lookup result, not a permanent property of the number.
Primary sources
- The National Telephone Numbering PlanOfcom. Verified 2026-07-19.
- National numbering plan: United KingdomInternational Telecommunication Union. Verified 2026-07-19.
- ITU-T E.164: The international public telecommunication numbering planInternational Telecommunication Union. Verified 2026-07-19.
See our editorial and sourcing methodology.
Calling Code