It sounds like you'll have to launch the app to change which three cards are stored on the Echo. This is actually too low of a number for me, so it would end up

It sounds like you'll have to launch the app to change which three cards are stored on the Echo. This is actually too low of a number for me, so it would end up being more of a hassle to launch the app all the time than it would be to just carry 5 cards everywhere.