There are, of course, lots of calendars, diaries, organisers and planners available for mobile phones. They all do similar things when you look at the basics but where lots of them struggle is in their lack of options. Not so with Handy Calendar. Because where Handy Calendar thrives is in its functionality and features that you really do need. The main display is a calendar but you can change this, as with Outlook, to break it down into a month, a week or a single day view.