This issue should be tested both in Android and iOS. In web, login in a 3.4+ site as admin and create several calendar events of all kinds: site, course, category, user and group. In the app, login as admin and go to view the calendar. Check that you see a monthly view instead of a list. In tablet you should be able to view the list of events in a day, in mobile you will only see some dots to indicate which type of events are on that day. Check that you can navigate through months using the top arrows. Check that you can go to current month by clicking the calendar with an X in a top right. Check that you can view the list of upcoming events by clicking the list icon in the top right. Check that you can view an event details by clicking it, either in list view or in calendar view. Check that you can filter the course being viewed using the top-right filter button. Click a day. Check that you view the events in that day. Check that you can navigate through days using the top arrows. Check that you can go to current day by clicking the calendar with an X in a top right. Click an event, check that the event details are opened.