Phone: iPhone 5s, iOS 9.3.1 Computer: Mac mini, OS X 10.8.5 (Mountain Lion) If I create a calendar event on my phone, it gets into iCloud in a matter of seconds. It then takes a minute or a little more to appear in Calendar on my Mac. (This may well be because of the old Mountain Lion operating system on my Mac.) If I create a calendar event on my Mac, it also gets into iCloud in a few seconds (despite my old OS on the Mac!). But it then takes 15 or 20 minutes or even longer before it appears on my phone. Why can this be? Surely not anything to do with the age of the OS on my Mac. Once the event shows up on iCloud, matters are out of my Mac's control and I can even switch it off. Is it one more iOS 9.3 bug, not corrected in 9.3.1? Or is it something to do with my carrier (EE)? But why in that case is phone > iCloud so quick and iCloud > phone so slow? I should be very interested in and grateful for any information about this.