When I tried to install the trello app on my iPhone 5 a few days ago, it told me, that the app requires IOS 10.x. So I updated to IOS 10.3.3 on Dec 3rd. This is the highest version available on the iPhone 5. Then I retried to install trello, but now the trello app requires IOS 11.x. Please let me know, how to install trello on my iPhone. Thx!