A plumber is often contacted in an emergency. Their virtual business card must therefore make calling instant, show the service area, and reassure through reviews.
For a plumber, the virtual business card is a call trigger: instant contact, a clear area, and visible reviews. Stick the QR code on the van and every client becomes a contact.
Put a clearly visible call button at the top of your business card.
Yes, specify your service towns and cantons directly on the card.