Are 08 numbers free to call on Vodafone?

Depends on the type of number as 0800 and 0808 prefixes are always free to call on Vodafone tariffs. However service numbers which start with 083 and 087 prefixes are never free to call.

08 numbers can be divided into two distinct categories: freephone helplines and service numbers. Domestic calls to freephone numbers, which start with 0800 and 0808 prefixes, are always free on all landline and mobile network operators in the United Kingdom, including Vodafone. However service numbers which start with prefixes such as 0843, 0844, 0845, 0870 and 0871 are never free to call on Vodafone. Additionally inclusive minutes on your tariff cannot be used instead of incurring these charges when calling service numbers

Cost of calling 08 numbers on Vodafone