Important question: Are you using Google's Calendar app or are you using the OEM calendar app that came with your phone? It's an important distinction. The sec

Important question: Are you using Google's Calendar app or are you using the OEM calendar app that came with your phone? It's an important distinction. The second rate calendar apps pushed out by the phone manufacturer are generally pretty buggy and hardly ever see proper updates for security or bugs. Solution: Download Google Calendar from the Play Store here: https://play.google.com/store/apps/details?id=com.google.android.calendar&hl=en https://play.google.com/store/apps/details?id=com.google.and... Open it up and give it access to your calendar, contacts, etc as requested. Then go and disable the calendar app that came with your phone.