This app was mentioned in 2 comments, with an average of 1.00 upvote
T-balance check can show the balance on physical cards.
https://play.google.com/store/apps/details?id=com.rwal.tmoney&hl=en
Android Beam to send pictures to friends who had cameras inferior to mine.
I also used it to check the balance on my transit card while I was in Korea.
https://play.google.com/store/apps/details?id=com.rwal.tmoney&hl=en
and for my transit card in Japan.
https://play.google.com/store/apps/details?id=yanzm.products.suicareader