Avoid Bank Fees Modal Dialog Needs Cancel Option


I’ve just requested a top up EUR-GBP on iOS. A message appears “To avoid bank fees you should …”. You are presented with two options “Yes…” or “No…”. However, I just realized I made a mistake. I want to cancel the procedure but I can’t because there’s no cancellation option.

My expectation is for modal dialog boxes to have an option to cancel operation. I have to press the home button to get out but when I log back in, I’m presented with the same modal dialog again and again. No way out until you close the app by swipe closing.