0303 UK-wide numbers
Ofcom’s numbering data lists 1,000 number ranges starting 0303, allocated to 27 providers. The largest holder is BT, with 3% of them. Non-geographic numbers used by public bodies, charities and businesses that want one number for the whole country. 030 is used by public sector and not-for-profit organisations.
Who were 0303 ranges given to?
Providers Ofcom allocated these number ranges to.
- Not allocated to a provider939 ranges
- BT25 ranges
- Colt Technology Services5 ranges
- Gamma Telecom Holdings Limited4 ranges
- GCI Network Solutions Limited2 ranges
- Telecoms World Direct Limited2 ranges
- Windsor Telecom Limited2 ranges
- Nuso Cloud UK Limited1 range
- Suretec Systems Ltd1 range
- TelXL Limited1 range
- Mintaka Limited1 range
- Digital Space Group Limited1 range
+ 16 more
Range status
How Ofcom lists the ranges starting 0303.
Allocations by year
Explore by the next digit
Each block below starts 0303. Pick one to narrow it down.
What a 0303 number tells you
What it is
Non-geographic numbers used by public bodies, charities and businesses that want one number for the whole country. 030 is used by public sector and not-for-profit organisations.
What it costs
Never cost more than calling an 01 or 02 number, and count towards inclusive minutes.
Watch out for
Banks and government departments often use 03 numbers, so scammers spoof them. If a caller asks for security details, hang up and call the number on your card or statement.
0303 numbers: common questions
Who owns 0303 numbers?
Ofcom allocated the ranges starting 0303 to BT, Colt Technology Services, Gamma Telecom Holdings Limited and others. Numbers can be moved between providers, so this shows who the range was originally given to – not who is using a particular number today.
How do I call a 0303 number from abroad?
Replace the leading 0 with +44. For example, a number starting 0303 becomes +44 303 followed by the rest of the number.
How much does it cost to call a 0303 number?
Never cost more than calling an 01 or 02 number, and count towards inclusive minutes.
Is a call from a 0303 number a scam?
Banks and government departments often use 03 numbers, so scammers spoof them. If a caller asks for security details, hang up and call the number on your card or statement. Check the full number on Who’s Calling to see if it belongs to a verified business and what other people have reported.
Did a 0303 number call you?
Check the full number to see if it belongs to a verified UK business and what other people have reported.
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