Updated : October 29, 2026Need to call, save, or share a UK phone number, but not sure you have it right? A missing 0, an extra digit, or the wrong country code is all it takes for a call to fail.
The good news is that UK phone numbers follow a simple pattern. Once you know it, you will never get it wrong.
In this guide, we break down the UK phone number format in plain English, with clear examples, so you can dial, write, and share any UK number with confidence.
What is the UK Phone Number Format?
The UK phone number format is simple: a 0 at the start, followed by 10 more digits, for a total of 11 digits. This is set by the UK’s national numbering plan, which Ofcom (the UK telecoms regulator) manages.
Every United Kingdom phone number has three parts:
- Trunk prefix (0): Used only for calls within the UK.
- Area code: Shows the location for landlines (020 = London) or 07 for mobiles.
- Subscriber number: Identifies the person or business you are calling.
For example, in 020 7946 0000, the 0 is the trunk prefix, 20 is the area code for London, and 7946 0000 is the subscriber number. Area codes in the UK can be 2 to 5 digits long (after the 0). The shorter the area code, the longer the subscriber number, so the total length stays the same.
1. What the First Digits Tell You
The first two digits of UK phone numbers tell you what kind of number it is:
Numbers starting with Type Used for
2. The UK Country Code: +44
The country code for the United Kingdom is +44. When someone calls from another country, the leading 0 is dropped, and +44 takes its place. So 0161 496 0000 (Manchester) becomes +44 161 496 0000.
The UK country code also covers the Isle of Man, Jersey and Guernsey, which use UK-style numbers.
Key Differences Between Mobile and Landline Formats
The easiest way to tell them apart: UK mobile numbers start with 07, landline numbers start with 01 or 02. Both have 11 digits, but they are grouped differently and behave differently.
Feature Mobile phone number Landline (geographic) number
A few things to keep in mind:
- Mobile numbers have no area code. The 07 block shows the number is a mobile, not where the person lives. A mobile number can be used anywhere in the UK, and people keep the number when they switch networks.
- Not every 07 number is a mobile. Numbers starting with 070 are “personal numbers” that forward calls elsewhere and can cost much more to call. Numbers starting with 076 are mostly pagers. Real mobile phone numbers start with 071 to 075 or 077 to 079.
- Landline numbers carry a location. The area code tells you roughly where the number is based. That is why many businesses want a local area code: it builds trust with local customers.
UK Phone Number Examples
Below is a UK phone number sample for every common type. Each one is shown in UK (domestic) format and in international format, so you can copy the pattern you need.
1. Landline Numbers
Landline numbers start with 01 or 02 and are grouped by the length of the area code.
Area Area code Domestic format International format
The common landline patterns are:
- 02x xxxx xxxx for big cities like London, Cardiff, Southampton, Portsmouth, Coventry and Northern Ireland
- 011x xxx xxxx and 01×1 xxx xxxx for large cities like Leeds, Sheffield, Manchester and Liverpool
- 01xxx xxxxxx for most other towns
- 01xxxx xxxxx for a small number of rural areas
2. Mobile Numbers
UK mobile numbers always follow the same pattern: 07xxx xxxxxx.
- Domestic: 07700 900000
- International: +44 7700 900000
The mobile number format is the same no matter which network (EE, Vodafone, O2, Three, and others) the person uses.
3. Business and Non-Geographic Numbers
Non-geographic numbers are not tied to a place. Businesses use them so customers can reach them on one number from anywhere in the UK.
Number type Example International format Cost to call (indicative)
The UK also has short special services numbers that do not follow the 11-digit pattern:
- 999 or 112: Emergency services (police, fire, ambulance, coastguard)
- 111: NHS non-emergency medical help
- 101: Police non-emergency line
- 105: Power cut helpline
4. Domestic vs. International Formatting Rules
The only real difference between the two formats is the start of the number.
Rule Domestic format (within the UK) International format
There is also the E.164 format. This is the global standard for phone numbers, used by phone systems, CRMs, apps and SMS tools. It is the international format with no spaces, brackets or dashes: +442079460000. An E.164 number can be at most 15 digits long.
5. Best Practices for Writing UK Phone Numbers
- Use spaces to group digits the standard way: 020 xxxx xxxx for London, 07xxx xxxxxx for mobiles. This makes the number easy to read and remember.
- Use the international format on websites, emails and business cards if you have customers abroad: +44 20 7946 0000.
- Do not write +44 (0) 20. It is common, but it confuses callers, who may dial the 0 after +44. Pick one format: +44 20 or 020.
- Do not split the area code. Write 020 7946 0000, not 0207 946 0000. London has one area code: 020.
- Use E.164 in software: +442079460000.
- Label the number if it is not obvious, for example “Freephone: 0800 …” or “Mobile: 07…”.
Expand into the UK market and give customers a local number they recognize and trust instantly.
How to Call a UK Phone Number?
How you dial depends on one thing: are you calling from inside the UK or from another country? Inside the UK, dial the number with its leading 0. From abroad, dial your exit code, then 44, then the number without the 0.
1. Calling From Within the UK
- For Landline Calls: Dial the full number, including the area code: 0 + area code + subscriber number. Example: to call a London landline, dial 020 7946 0000.
- For Mobile Calls: Dial all 11 digits, starting with 07. Mobile numbers have no area code, so there is nothing to leave out. Example: dial 07700 900000.
- Local Calls Within the Same Area Code: If you are calling from a landline to another landline with the same area code, you can usually skip the area code and dial only the subscriber number. Example: from a Manchester landline, you can dial 496 0000 instead of 0161 496 0000.
This does not work when you call from a mobile phone. Mobiles always need the full number, including the area code.
2. Calling a UK Number From Abroad
To call a UK phone number from another country, use this pattern: Exit code + 44 + the number without the leading 0.
Calling from Exit code Calling a UK landline Calling a UK mobile
3. Steps for Landline Calls
- Dial your country’s exit code (for example, 011 from the US or 00 from India).
- Dial the UK country code: 44.
- Dial the area code without its leading 0 (for example, 20 for London, 161 for Manchester).
- Dial the subscriber number (for example, 7946 0000).
Full example from the US: 011 44 20 7946 0000.
4. Steps for Mobile Calls
- Dial your country’s exit code, or just press + on a mobile phone.
- Dial the UK country code: 44.
- Dial the mobile number without the leading 0 (so 07700 becomes 7700).
- Dial the remaining six digits.
Full example from India: 00 44 7700 900000, or +44 7700 900000 from a mobile.
Common Mistakes While Dialing or Writing UK Numbers
Most failed calls to UK phone numbers come from four simple mistakes. Here is how to spot and fix each one.
1. Missing Area Code
Leaving out the area code only works for landline-to-landline calls in the same area, and not even then in six areas (such as Bournemouth and Brighton). From a mobile, or from a different area, the call will fail or reach the wrong person.
- Wrong: 7946 0000
- Right: 020 7946 0000
2. Forgetting Country or Exit Code
From outside the UK, the number needs the exit code and the UK country code. The most common error is keeping the leading 0 after +44.
- Wrong: +44 020 7946 0000 or +44 07700 900000
- Right: +44 20 7946 0000 or +44 7700 900000
3. Inaccurate Digit Length
Count the digits. A UK phone number should have 11 digits with the leading 0, or 10 digits after +44. If you count 9 or 12, a digit is missing or repeated.
- Wrong: 0161 496 000 (10 digits)
- Right: 0161 496 0000 (11 digits)
A very small number of older numbers have 10 digits with a leading 0, so if a number is one short, check with the source before you assume it is wrong.
4. Combining Mobile and Landline Formats
Mobile numbers have no area code, so do not add one. Also, do not split a mobile number like a London landline.
- Wrong: 020 7700 900000 or 077 0090 0000
- Right: 07700 900000
How to Get a UK Phone Number With CallHippo?
With CallHippo, you can get a UK local (020, 0161, and more), mobile (07), or toll-free (0800/0808) number in minutes. No SIM card, office, or physical phone line in the UK is needed.
- Sign up for CallHippo and start your 10-day free trial (no credit card needed).
- Pick your UK number by type and area code.
- Set it up with call forwarding, IVR, and SMS, and take calls from the desktop or mobile app.
Conclusion
The UK phone number format comes down to a few simple rules. Most numbers have 11 digits and start with 0. Mobile numbers start with 07, landlines start with 01 or 02, and 03, 080, 084, 087, and 09 numbers are non-geographic numbers with their own costs. From abroad, replace the leading 0 with the UK country code +44.
Get these rules right, and your calls connect, your SMS messages are delivered, and your customers can always reach you.
Get a UK local, mobile, or toll-free number in minutes with CallHippo. No credit card needed.
FAQs
1. How many digits are in a UK phone number?
Most UK phone numbers have 11 digits, including the leading 0, like 020 7946 0000.
2. What’s the proper format for sharing a UK number internationally?
Use +44 and drop the leading 0: +44 20 7946 0000. For CRMs and software, remove the spaces: +442079460000.
3. Does +44 replace the 0 in a UK phone number?
Yes. 07700 900000 becomes +44 7700 900000. Never dial +44 0.
4. Do UK phone numbers have 10 or 11 digits?
Both. A UK number has 11 digits, with the leading 0 and 10 digits after +44.
5. What area code should I use for a UK business number?
Use a local code (like 020 or 0161) to look local in one city, 03 for one UK-wide number, or 0800/0808 if you want customers to call free.
6. What’s the difference between 03, 08, and 09 UK numbers?
03 numbers cost the same as a normal landline call. 0800 and 0808 are free to call, while 084 and 087 add a small service charge. 09 numbers are premium rate and the most expensive to ca
Published : October 29, 2026
Harsh Bairagi is a B2B SaaS content writer with over 4 years of experience in the tech industry. Harsh believes in creating good copies to bridge the gap between tech and emotion. When not chasing clean copy or clever metaphors, he is busy catching up on his favorite sports.
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