United Kingdom Phone Number Format Guide
Quick Overview
UK mobile numbers start with 07 and are 11 digits long when dialed within the UK, or 10 digits with the +44 country code.
United Kingdom Phone Number Generator
Need to generate United Kingdom phone numbers for testing? Use our free phone number generator tool that follows all the latest United Kingdom number format rules and conventions.
Try United Kingdom Phone Number GeneratorUnited Kingdom Phone Number Format Structure
UK phone numbers follow different formats for mobile and landline numbers:
Mobile Number Components
- Country Code: +44
- Mobile Prefix: 07xxx (UK) or 7xxx (international)
- Subscriber Number: 6 digits
Format Examples
+44 7700 900123- International format07700 900123- UK format07700-900-123- Hyphenated format7700900123- Plain format
United Kingdom Phone Number Network Operators
Mobile number prefixes in the UK are assigned to specific operators:
Major Networks
- 074xx, 07624: EE (formerly Orange)
- 075xx: Vodafone
- 077xx, 079xx: O2
- 073xx, 078xx: Three
- 07700: Test numbers
Virtual Operators
- Virgin Mobile: Uses EE network
- Tesco Mobile: Uses O2 network
- giffgaff: Uses O2 network
- ASDA Mobile: Uses Vodafone network
United Kingdom Phone Number Rules and Restrictions
Number Rules
Mobile numbers must start with 07 (UK) or +447 (international)
Total length must be 11 digits for UK format
Certain number ranges are reserved for special purposes
Special Considerations
- 07700 900000 to 900999 are reserved for testing
- Emergency numbers: 999 and 112
- Non-geographic numbers start with 08, 09, or 03
United Kingdom Phone Number Recent Changes
- Introduction of 071-075 ranges for 5G services
- Merger of T-Mobile and Orange into EE
- Implementation of number portability across all networks
- Phasing out of pagers and older number ranges