On the Android app, when you go to the wallet it displays your various credit cards like a deck of cards with only the default card visible on the top of the deck. I wanted to change the default, but there seemed to be no way to select any card for modification/setting as default except the one on the top of the deck, which is already the default. Am I doing something wrong or missing some gesture, button, etc??? (I ended up just going to the United website on my laptop to change the default card...)