iPhone Doubles Contact List in OS 3.0

Prior to syncing your iPhone with MobileMe, be sure to turn off the syncing of your address book in iTunes or you will end up with double contacts when you view the list “All Contacts” in your address book on your iPhone. This may seem like a no brainer to some, but it had me baffled for a while.
I had an issue with the speaker port on my iPhone 3G, and sorry to say *cough*, it had to be replaced with a new phone under Applecare. I have had “MobileMe” since it was .Mac, so I was in the Apple Store with a fresh iPhone, ready to leave. No contact info in my phone, say wha?!? I don’t know about you, but I don’t memorize phone numbers. I rely on my phone to do that. So I sync up with MobileMe right in the store and I’m good to go.
Here’s the tricky part. I didn’t realize that if I already synchronized with MobileMe, iTunes would still add my contacts from my Mac, even though MobileMe gets it’s list from…my Mac. What I had to do was delete all of my email address information and re-sync with iTunes.
To avoid that mess, before you sync with iTunes, follow the steps below:
First, open iTunes. Go into Preferences in the File Menu, or hit ⌘-Comma. Under Devices, check the “Prevent iPods and iPhones from syncing automatically” checkbox:

iTunes Preferences--Devices

iTunes Preferences--Devices

Now you can plug in your iPhone, ad nothing will be automatically changed.

Next, select your iPhone in the Devices List,  and select the Info Tab at the top.  You want to uncheck any selections in that tab that would also be synced with your MobileMe account:

iTunes iPhone Info Tab

iTunes iPhone Info Tab

If you have doubled your contacts already, you may have to restore your phone in the summary tab, which is unfortunate, but sometimes worth it anyway.  I’ve read some posts about unhappy owners having to do this, as it takes some time.  Before you try that, you may want to sync/unsync whatever duplicate information you have stuck on your iPhone and see if iTunes will remove it.

If you have tried this to no avail, please comment below and I’ll try to help you sort it out.  If it worked, please let me know that, too.

Thanks for stopping by.  :)