National non-geographic 0345 numbers are not free to call on Vodafone.
0345 numbers are used by organisations as customer service helplines as well as sales hotlines, their usage increased greatly in 2015 as Ofcom outlawed the more expensive 0845 numbers for most functions. However 0345 numbers are not technically free to call on Vodafone unlike 0800 and 0808 freephone numbers, meaning you will normally have to pay a charge consisting of a per-minute payment as well as a per-call access fee. However you can phone 0345 numbers without paying a penny if you have inclusive minutes as part of your Vodafone calls package, all you will lose in this case is the minutes from your balance equivalent to the time taken during the call.