I downloaded this app on my tablet long time ago (full version) and recently also downloaded it on my phone as I don't bring my tablet with me all the time. I only use the "task" function, because  my  calendar events do not sync properly (I haven't fpnd the sync button on my phone...) and another not so funny thing for me: I am using the same account for both devices, BUT I can't use the full version on my phone (I get a message that I need to buy it (???)...) that's why I need to use my tablet (with the full version on it) if I want to add something.