I have an iPhone and an iPad, both with iOS 6.1. I use iCloud for calendar syncing between them and my Mac. For whatever reason, the iOS devices don’t sync calendars with iCloud unless and until I open the Calendar app on the device. Is there any way to change this behavior so that iOS checks for calendar changes without my intervention?
(This is very annoying for two reasons: I set alarms on events frequently, but each time I do this on my computer I have to remember to launch Calendar on my phone or else it won’t know about the new event and it won’t remind me. Moreover, I don’t even use Calendar—I use Fantastical on the phone and Calvetica on the iPad—so it’s out of my way even to launch the Calendar app.)