03 numbers
0300 Numbers
0300 numbers are UK non-geographic national rate numbers — callers pay the same as a standard 01/02 landline, and calls are included in most UK mobile and landline bundles. Widely used by the NHS, government and charities, 0300 numbers are also available to businesses. ONSIM can provide 0300 numbers from £5/month + VAT.
What is a 0300 number?
0300 numbers sit within Ofcom's 03 range — a family of UK non-geographic numbers introduced so that organisations could offer a consistent national contact number without implying a specific location.
Calls to 0300 are charged at standard local rate and included in mobile and landline call bundles. This makes them genuinely accessible for callers — particularly important for public-facing organisations where callers should not face a cost barrier to getting in touch.
Who uses 0300 numbers?
0300 numbers are used primarily by UK public sector organisations and non-profits, including NHS trusts and GP practices, local councils, government departments, police non-emergency lines (101 uses the same charging principle), charities and housing associations.
Private businesses may also use 0300 numbers, particularly those working closely with the public sector or wanting to convey a similar accessible, non-commercial feel. For most commercial businesses, 0330 numbers are the more common choice.
The 03 number range explained
0300 is one of several number types within Ofcom's 03 range. All share the same call charging rules — local rate, included in bundles — but each sub-range carries different associations.
| Number range | Typical users | Cost to caller |
|---|---|---|
| 0300 | Government, NHS, charities, public sector | Same as 01/02, included in bundles |
| 0330 | Commercial businesses, national services | Same as 01/02, included in bundles |
| 0333 | Commercial businesses | Same as 01/02, included in bundles |
| 0345 | Large businesses, banks, utilities | Same as 01/02, included in bundles |
Getting a 0300 number with ONSIM
ONSIM provides 0300 numbers as part of its 03 virtual landline range. Your 0300 number rings on your existing mobile via call forwarding at network level — no app, no VoIP, no broadband dependency.
Start with Virtual Landline from £5/mo for inbound calls, or upgrade to Landline SIM from £10/mo if you also want outbound calls showing your 0300 number.
0300 vs 0330 — which should you choose?
Both cost callers the same and both are included in call bundles. The choice is mainly about the impression you want to create.
If you are a charity, NHS-affiliated service, local authority or public body — or if you want to convey that kind of accessible, public-service feel — 0300 fits naturally. If you are a commercial business looking for a national number, 0330 or 0333 are the more common choice.
0300 number FAQs
Common questions about 0300 numbers, who uses them and how they work.
Get a 0300 number with ONSIM
0300 numbers from £5/month + VAT — rings on your existing mobile, no app, no VoIP. Set up in minutes.