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This question already has an answer here:

A couple of days ago all the contacts from my iPhone 4 disappeared.

I am not sure how to restore them using iTunes. I am afraid that if I plug the iPhone to my computer it will sync the other way around and delete whatever I had stored as a back up on my computer… Any of you know how to get those contacts back on the phone?

Thanks!!!

marked as duplicate by bmike Sep 5 '13 at 19:49

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If you have sync'd your iPhone very recently, but just before the disappearance of the contacts, then you should be ok. The first part of each iTunes sync process is a backup.

I would make sure the Address Book data in the Mac is backed up. I would then connect the iPhone, open iTunes, and sync.

If still no joy, then restore (an option in iTunes) the iPhone from an earlier backup to get them back, and then update the apps as needed.

If your iPhone is jail-broken or otherwise hacked, don't try the above until you have proven beyond a doubt that no haerm will be done.

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