I was in Mumbai and Berlin. I did not need my smartphone to pay, but to display my vaccination certificate which is required at most places and to scan the menu which these days is replaced with a QR code placed on the table
Each time I got jabbed, they gave me a little cardboard "certificate" the size of a credit card. I carry them in my wallet, but I've never had to produce them anywhere. Perhaps I'm going to the wrong places.
