0333 Area Code
UK non-geographic number range: what 0333 numbers are, who holds them, and what to do about a call you don't recognise.
What Is the 0333 Area Code?
UK non-geographic number. 0333 numbers are UK non-geographic numbers, used by businesses, charities and public bodies. They are not tied to a place, cost no more to call than an 01 or 02 landline, and count towards inclusive minutes.
Who was the range allocated to?
Ofcom has allocated 0333 numbers to 134 providers. The largest holders are Gamma Telecom Holdings Limited, Colt Technology Services and GCI Network Solutions Limited.
Numbers can be moved (ported) between networks, so the network a caller uses today may not be the one Ofcom allocated the block to. The allocation does not identify the person or business using a number.
Had a call from a 0333 number you don't recognise?
We can't tell you who called: an area code only shows the type of number and the provider Ofcom allocated the range to.
- Don't call back in a hurry, even if a message says it's urgent. Never give bank details or security codes on a call you didn't expect.
- Block the number from your phone's recent calls list.
- Forward scam texts free to 7726. Report unwanted marketing calls to the ICO, and see Ofcom's advice on scam calls.
- Register your number with the Telephone Preference Service to opt out of sales calls.
About the 0333 Range
| Number type | UK non-geographic number |
|---|---|
| Area | Not tied to a location |
| Number format | 0333 XXX XXXX |
| Allocated by Ofcom | 23% of the range, to 134 providers |
| First allocation on record | 26 March 2007 |
| Most recent allocation | 12 August 2026 |
Largest holders of 0333 numbers
| Provider (as allocated by Ofcom) | Share of range | First allocated |
|---|---|---|
| Gamma Telecom Holdings Limited | 2% | 26 March 2007 |
| Colt Technology Services | 2% | 26 March 2007 |
| GCI Network Solutions Limited | 1% | 20 April 2017 |
| TalkTalk Communications Limited | under 1% | 24 May 2007 |
| Glide Student and Residential Limited | under 1% | 7 February 2013 |
| Windsor Telecom Limited | under 1% | 26 March 2007 |
128 more providers hold smaller blocks.
Allocation data: Ofcom numbering data, as published 28 October 2026.
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Common Questions About 0333 Numbers
Is 0333 a free number?
No, but it is not premium rate either. Calls to 0333 numbers cost no more than calls to an 01 or 02 landline and count towards inclusive minutes on mobile and landline packages.
Where is the 0333 area code?
Nowhere in particular. 0333 is a non-geographic number, so it is not tied to a town or region. It costs the same to call as an 01 or 02 landline.
Who does the 0333 range belong to?
Ofcom has allocated 0333 numbers to 134 providers. The largest holders are Gamma Telecom Holdings Limited, Colt Technology Services and GCI Network Solutions Limited. Numbers can be moved (ported) between networks, so the network a caller uses today may not be the one Ofcom allocated the block to. The allocation does not identify the person or business using a number.
Who called me from a 0333 number?
We can't tell you who called. An area code only shows the type of number and which provider Ofcom allocated the range to. If you don't recognise a 0333 number, don't call back in a hurry, and never give out bank details or security codes on a call you didn't expect.
Block the number from your phone's recent calls list. Forward scam texts free to 7726, report unwanted marketing calls to the ICO, and see Ofcom's advice on scam calls.