I have iPhone 3g and macbook pro - syncing up contacts and calendar. Husband has iPhone 3gS on Windows laptop. Recently, for unknown reasons all of his contacts from his phone are now on my phone and all of my contacts from my phone are on his phone. Why? How can I stop this syncing of unwanted content?
Did he may sync his phone to your MacBook Pro? If so, it may have resulted in a merged contact list. To keep things separated, sync to different computers, or if he wants to sync with your computer, have him deselect Sync Contacts on the Info tab of his iTunes sync settings.