Lost contacts, iPhone 4
My wife's iPhone 4 has suddenly decided to delete all her contacts. She didn't connect to iTunes or do anything out of the ordinary.
The phone kicked her out of a few applications back to the home screen, so she switched the phone off and on again.
On checking contacts, she saw the entire lot were gone.
No idea if they were gone before the switch off or not but all seems very strange.
Subsequently updated to the latest OS6 to see if that would help (which it didn't!) but was running OS5 when the problem occurred
iPhone 4 (8GB), iOS 5.1.1