It's very strange, I have one device (iphone6) with iOS 8.4 (b3 and now b4), which shares the AppleID with another device (iPhone 5s - iOS 8.3). Both are using the same iCloud settings and iTunes library/login for iTunes match. Both back up to the iCloud backup but as different devices. Suddenly (soon after switching the iPhone 6 to 8.4b3, I *think*) the telephone call list of my iPhone 5s got duplicated on the iPhone 6 but not the other way round. After I had phoned my 5s the other day to find it my 6 showed "missed call from [my iphone 6]" in the night. This is puzzling. Anyone else encounter this?