Phone Number Format Guide

Formats & Generator

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UK Phone Number Format Guide and Examples

Dial Code: +44•Last updated: January 1, 2026

Local Format
07911 123456
E.164 Format
+447911123456
International
+44 7911 123456

About United Kingdom Phone Numbers

UK mobile numbers typically start with 07, followed by 9 digits. Landlines start with 01, 02, or 03. Geographic numbers vary in length depending on the area code.

How to Dial United Kingdom Phone Numbers

To call a UK phone number, the exact format depends on where the call starts. Domestic calls usually keep the leading 0, while international calls to the UK use the +44 country code instead.

  • Within the UK: Dial the full national number, including the leading 0 for standard domestic calls.
    Example: 07911 123456
  • From abroad to the UK: Dial +44 followed by the national number without the leading 0.
    Example: +44 7911 123456
  • From the UK to other countries: Dial 00, then the country code, then the full phone number.
    Example: 00 1 212 555 0123

Note: UK domestic numbers often begin with 0, but that prefix is dropped when the number is written in international format.

Phone Number Structure

This table breaks down the example number shown for United Kingdom.

ComponentDigitsExampleNotes
Country Code2+44Used for international format and replaces the leading 0 used in domestic dialing.
National Prefix10Domestic UK numbers normally start with 0 before the rest of the national number.
Mobile Range47911This page uses a mobile example; domestic mobile numbers typically begin with 07.
Subscriber Number6123456The remaining digits identify the individual mobile line in this example.

Special Cases

Some numbers and prefixes in United Kingdom have special rules or reserved uses.

  • Emergency Numbers (999 and 112)

    999112

    Any end-user in the UK must be able to reach emergency organisations using 999 or 112 at no charge. These are special emergency call numbers, not ordinary subscriber numbers.

  • Freephone Numbers

    08000808

    UK numbers beginning with 080, including 0800 and 0808, are free-to-caller ranges and are commonly used for helplines and customer support.

  • Premium-Rate and Phone-Paid Services

    09118087084

    These ranges can carry extra service charges and are used for premium-rate or phone-paid services, such as directory enquiries, competitions, and specialist helplines.

Validation Regex

regexregex
^\+44[1-9]\d{1,4}\d{6,8}$|^07\d{9}$

Code Examples

CSS Masking Format

Use this CSS mask to automatically format phone number inputs:

cssinput-masking.css
input[type="tel"] {
  mask: 00000 000000;
  mask-image: none; /* Fallback */
}

Other Countries

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