The My Vodafone app is free to use. You might pay data charges when you download it, unless you have data included in your Pay monthly bundle or you have Freebie Data on Pay as you go.
The Wi-Fi Finder section of the app uses Google Maps and Apple Maps, which are chargeable. They’ll use data from your allowance or credit, or data charges will apply.
Check out who can get the My Vodafone app