Originally Posted by
bocastephen
Thank you - moving the card balance within Apple Pay is easy, that's no problem - it's the JR Suica app itself from the App Store. If it can be installed and automatically picks up whatever Suica card is in Apple Pay, then it's no problem to migrate, but I just can't remember how I setup the app in the first place which is making the migration plan a headache.
FWIW, I did not have to put the suica app on my new phone at all. Everything was done with Apple Pay/iCloud. I think the app is only needed to create a new suica.