If you replace or change your device, you'll need to add your card(s) to the Passbook or Wallet app again.
Just make sure you remove your card(s) from any device before you replace it. You should also remove your card(s) if you give your device to someone else for things like repairs.
You can remove a card from Apple Pay at any time. Just go to Settings, select Passbook & Apple Pay or Wallet & Apple Pay, tap the card that you want to remove and choose Remove Card.