When you call a 0300 number from a mobile, it should cost no more than calling a regular UK landline (01 / 02). Regulation requires that calls to 03-prefix numbers (0300, 0333, etc.) be included in any deal or bundle that covers geographic numbers.
That said, actual cost depends on your provider, whether you’ve used your inclusive minutes, and whether your plan is pay-as-you-go or contract.
Example Price Table:
| Mobile scenario | Typical per-minute rate | Cost for a 5-minute call |
| Inclusive minutes (contract) | 0p | Free / included |
| Pay-as-you-go / out-of-bundle (low) | ~ 3p | ~ 15p |
| Pay-as-you-go / out-of-bundle (high) | ~ 40p | ~ £2.00 |
Costs vary by provider but are capped so they cannot exceed the equivalent of a call to a UK landline. (Prices correct as of 2025)
What affects what you pay?
- Inclusive minutes: If your mobile plan includes calls to UK landlines, 0300 numbers are included.
- Out-of-bundle use: Without inclusive minutes, you’ll pay per minute — usually between 3p and 40p.
- Provider policies: Networks set different rates within that band.
- Connection fees: Some plans still add a one-time connection charge.
Official Guidance
- Calls to 03 numbers cannot cost more than calls to 01/02 numbers under UK rules.
- Out-of-bundle mobile calls to 01 / 02 / 03 numbers can cost 3p to 65p per minute, depending on the provider.
- 03 numbers are specifically designed to be fairer and avoid the high costs associated with 08 or 09 ranges.
In Conclusion
- 0300 numbers cost the same as landlines from mobiles.
- They are included in call bundles where landlines are covered.
- Outside bundles, expect 3p to 40p per minute, with variation by provider.
- Always check your mobile plan’s out-of-bundle rate to be sure.
To find out more about 0300 numbers, call 0330 332 0400.
