[Shlov1]

Can someone tell me why all of a sudden I have in my contacts, the same person listed multiple times? It all of a sudden happened? Did I change some setting or something? Please help?

[Alli]

What are you syncing your contacts with - iTunes? Outlook? Google? Are you using any 3rd party contacts apps on your iPhone?

[ghostface147]

My cousin has this same issue. He syncs to iTunes. Weird.

[lungho]

I've had this issue when I first setup and synced with Google. But once I deleted the dupes, the problem never reappeared.

[Shlov1]

Yeah, I sync with Google and when I went on gmail I saw that there were dupes on there also. It is weird. Also, some of my contacts have been reorganized and are listed my multiple identifiers (i.e. last name and first name both). I can change the group to be my phonebook and it will work fine but I don't remember this happening before. Can anyone give me some advice?

[Alli]

As lungho said, I also had the problem when I first started syncing with Google. I'm not sure why it happens. Only thing to do is go in to Google and delete the dupes.

[John T]

I have this problem too, syncing Mac Address Book via iTunes. After deleting the dupes on the iPhone, some have been known to come back!

I suppose the best thing to do, after deleting the dupes, is to delete the backup and let iTunes create a new one in the next sync. So far, I haven't taken the trouble to do this!

[aero11616]

Had the same issue. I was thinking it might have to do with Facebook syncing contacts, but I'm not positive.

[Barrett316]

often times the dup. contacts come from having the device synced with the address book as well as over a web service such as google or mobileme. often times the easiest way to fix this problem is uncheck the "sync contacts with iphone" from the info pane in itunes when the phone is plugged in.