Welcome to Vodafone Community
Going from the official Vodafone support pages
It states " An eSIM is a tiny chip that’s already installed in your device. Vodafone Pay monthly customers can enjoy the flexibility of an eSIM on a number of compatible devices. "
So if you took out a Pay Monthly Contract then as long as your phone has an esim available you can choose that option.
Current Phone >
Samsung Z Fold³ 5G.
Previous Phone >
Samsung Note 20 Ultra 5G - SM9860.