My iPhone 5 synced contacts from my wife's iPhone 5 My iPhone 5 (iOS 6.1.2) synced contacts from my wife's iPhone 5 (iOS 7.0.2) and changed many of them (changed names to contacts with similar numbers). She uses my Apple ID, but contacts transfer from her phone to mine. Does anyone know why does it syncs contacts?
If you use the same Apple ID for iCloud on both devices then it will sync data like contacts between the two. I would suggest you sign out of iCloud on your device and create a new Apple ID for yourself.