I have an iPad and iPhone. I told both to sync contacts with the iCloud. I noticed just a bit ago my iPhone contacts were gone. They were still on my iPad though. I couldn't figure out what was going on. I tried adding a contact on my phone and the contacts app crashed. But when I started it, all my contacts were back. A few minutes late, I wanted to add a new phone number to an existing contact via iMessage. I clicked on add to existing contact and my contacts were gone again! After a second or two, it crashed. I tried this again and they were back. Seems to be flakey. Maybe it just needs a reboot. Hope it's not going to be buggy like this all the time.