Free tool
UK Phone Number Checker
Paste any UK phone number to find out what type of number it is, where it is from, and which network operator Ofcom originally allocated the number block to. Uses official Ofcom numbering data.
How the lookup works
- We match the number you enter against Ofcom's official UK Numbering Data.
- For landlines (01/02), we show the area or city the code is allocated to.
- For mobiles (07), we show the network operator originally allocated to the number block. The number may have been ported since.
- For 03/08/09 numbers, we show the number type, the allocated communications provider, and a note on how it is charged.
- All data is refreshed against Ofcom's published dataset. Both Ofcom's numbering data and its area code table are used under the Open Government Licence.
Common UK number types
01 / 02
UK Landline (Geographic)
Traditional landline numbers tied to a specific city or area. Charged at your standard call rate, usually included in bundled minutes.
03
National Non-Geographic
Charged at the same rate as a landline (01/02) call, including from mobiles when calling within your bundle. Common business format (0300, 0330, 0345).
05
Corporate / Location-Independent
055 corporate numbers and 056 Location-Independent Electronic Communications Services. Rarely used commercially, mostly technical routing.
07
Mobile
UK mobile numbers, plus 070 personal numbering (which can be significantly more expensive to call) and 076 radiopaging.
0800 / 0808
Freephone
Free to call from UK landlines and mobiles.
084 / 087
Non-Geographic Revenue Share
Charged with a service charge plus your provider access charge. Ofcom requires the service charge to be disclosed at the point of promotion.
09
Premium Rate
Premium rate services (090, 091, 098). Per-minute charge varies by service and must be disclosed by the service provider.
1XX
Access Codes
Three-digit access codes (100 operator assistance, 111 NHS non-emergency, 112 EU emergency, 116 harmonised services, 118 directory enquiries, 999 emergency, etc). Not general-purpose telephone numbers.
Try a different area
ONSIM offers virtual landline numbers in every UK city. Some of the most common:
London 020
Greater London area
Manchester 0161
Greater Manchester
Birmingham 0121
West Midlands
Leeds 0113
West Yorkshire
Glasgow 0141
Central Scotland
Liverpool 0151
Merseyside
Every UK area code is available. Browse the full UK area codes directory, see all local numbers or learn about Virtual Landline (£5/mo).
Frequently asked questions
About the UK Phone Number Checker
What is a UK phone number checker?
A tool that tells you what type of UK phone number you have (landline, mobile, freephone, premium, etc.), what area or region it is associated with, and which network operator Ofcom originally allocated the number block to.
How do you find out who just called you?
Start with the number itself: paste it into the checker above to see what type of number it is, where it is from, and which network issued it - that alone rules a lot in or out. A geographic code can be checked against our area codes directory, and an 07 prefix against the mobile prefixes directory. If the caller left no voicemail and the number looks odd, do not ring it back: search the number, and if the caller claimed to be your bank or a company, contact that organisation on a number you found independently.
How do I find out who a UK phone number belongs to?
You can find out what a number is - its type, area and issuing network - free with this checker. You cannot find out the named individual or business behind it: no free public dataset exists that maps UK numbers to owners, and sites promising it rely on scraped or community-submitted guesses. If knowing the caller matters, the reliable route is contacting the organisation they claimed to represent via its official number.
How accurate is the lookup data?
The number-block allocations come directly from Ofcom, the UK regulator, updated weekly. The area code to city mapping comes from Ofcom's own area codes lookup tool. The tool is as accurate as Ofcom's published data.
Does it tell me who specifically called me?
No. UK phone number data does not include the name of the specific person or business that owns a number, and there is no free public dataset for that. This tool tells you what type of number it is, what area it is from, and which network operator was originally allocated the block, not who owns the individual number.
Can I use it for non-UK numbers?
No. This tool covers UK numbers only. If you enter a non-UK number, it will tell you it could not match the format.
Why does it say "originally allocated to" for mobile numbers?
UK mobile numbers can be ported freely between networks. The number block was allocated by Ofcom to a specific mobile operator when it was first assigned, but the current network for a specific number may be different if the owner has ported it. Public data does not include the current network after porting.
Is using this tool free?
Yes. Free to use, no sign-up, no data captured or stored about lookups.
Where does the data come from?
Number block allocations come from Ofcom's Numbering Data downloads. Area code to area/city mappings come from Ofcom's Telephone Area Codes tool. Both are published under the Open Government Licence.
How often is the data updated?
Ofcom publishes updates to the number allocations dataset most Wednesdays. This tool is refreshed against the latest Ofcom data periodically. The generation date is embedded in the underlying data file.
I think the number was a scam. What should I do?
Report it to Report Fraud (the service that replaced Action Fraud in December 2025) or by phone on 0300 123 2040. Do not call the number back. If you are with a UK mobile provider, you can also forward suspected scam text messages to 7726 (free of charge) - see our 7726 guide.
Can I report a number?
For scam and nuisance reports, use Report Fraud (see above). For issues with a specific number allocation, contact Ofcom directly. This tool is a free lookup service and does not maintain a scam reports database. For the fuller picture, see our guides to stopping spam calls and number spoofing.
Data source and attribution
Number block allocations from Ofcom's Numbering Data. Area code to area/city mappings from Ofcom's Telephone Area Codes tool. Both are used under the Open Government Licence v3.0.
This tool is provided free by ONSIM, a UK B2B telephony provider offering virtual landlines, business SIMs, and compliance-grade call recording. The tool does not store your lookups or track individual numbers.
Just want to know which network a number is on? Use our Network Lookup, the sibling tool focused on that one question. See also the PSTN Switch-Off Checker for the 2027 landline switch-off, or all free ONSIM tools.