Free tool
UK Call Cost Checker
Enter any UK number or prefix, tell it how you are calling, and see what the call will cost - free, covered by your minutes, or access charge plus service charge. Built on Ofcom pricing rules and provider tariff guides current as of August 2026.
Calling from
Cost guides by prefix
Here for business reasons?
This free tool is built and run by ONSIM, a UK business mobile network. If the number you are dealing with is your own business number - spam-magnet, tied to one handset, or about to be stranded by the landline switch-off - that is the actual problem we solve: business numbers on SIMs, owned by the business, from £5 a month.
Call cost questions
How accurate is the call cost checker?
The pricing structure (which ranges are free, included, or access-plus-service charge) comes from Ofcom's UK Calling rules and is exact. Access charges are taken from provider tariff guides current as of August 2026 - providers change them, so for the pence-perfect figure always check your own provider's price guide. Service charges are set per number by the organisation you call and must be displayed wherever the number is advertised.
Which UK numbers are free to call?
0800 and 0808 numbers, from all UK consumer landlines and mobiles. Everything in 01, 02 and 03 is covered by inclusive minutes on virtually all plans, which makes those calls effectively free for most people - but 084, 087, 09 and 118 numbers are never covered by inclusive minutes.
Why did a call to an 0844 or 0871 number cost so much?
Because two charges stack: your own provider's access charge (up to 98p a minute on some pay-monthly mobile tariffs) plus the service charge set by the organisation you called (up to 7p for 084, up to 13p for 087). A ten-minute call can exceed £10 before the service charge is counted. Check our 0844 and 0871 guides.
Do inclusive minutes cover 0345 and 0330 numbers?
Yes. All 03 numbers are required by Ofcom to cost the same as 01/02 landline calls, and they count towards inclusive minutes on mobile and landline plans alike. See the full 0345 cost guide.
What is an access charge?
The per-minute rate your own phone company charges for connecting calls to service numbers (084, 087, 09, 118), on top of the service charge set by the organisation you call. Introduced by Ofcom in 2015 to make these prices transparent. Each provider sets its own - currently ranging from 15p (Sky Talk landline) to 98p (EE pay monthly).
More free tools
- UK phone number checker - who a number was issued to and where it is from
- UK area codes directory and mobile prefixes directory
- Business number chooser - which number type your business should pick
- All free ONSIM tools
Sources: Ofcom call costs guide, gov.uk call charges, and provider tariff guides (August 2026).