Hold your iPhone or Apple Watch over the green Hop reader every time you board a bus or train, including when you transfer.
After a split second, you’ll see a green checkmark and hear a chime — that means you’ve paid your fare and you’re good to go! There's no need to open an app or even wake your device.
You won’t necessarily be charged every time you tap, but it validates your fare and serves as your proof of payment, so be sure to tap every time you board. Keep your phone handy in case an inspector asks to see your fare.