This post is part of a series about how to sync your contacts across multiple address books. Visit our sync center for a full list of our how-to guides.
You can sync your Mac Address Book with iPhone in three easy steps. This is a good way to make sure that your contacts and other information always stay backed up in case something happens to your iPhone.

Step 1: Connect your iPhone to your Mac
Take out the connector cord provided with your iPhone, and connect it with your Mac. Connecting it will automatically load up iTunes.
On the left hand navigation of iTunes, there is a section called Devices. The name of your iPhone should be listed there. Click into that if you’re not already there.
Step 2: Set up contacts sync
On the top navigation, navigate to Info, which is directly to the right of Summary.
The second option down is to Sync Address Book Contacts. Check this box.

If you’d like your Address Book Contacts to overwrite the contacts on your iPhone, you can also scroll further to Advanced. Under this section, you can check the Contacts to Replace information on this iPhone.
Step 3: Start your sync
Once you’ve completed setup, click the Apply button on the bottom right and iTunes will begin your sync. Based on how many contacts are being changed, iTunes may show you a few popups about a significant number of contacts being changed or conflicts arising. Follow their wizard to resolve your merged details, and you’ll be all set.
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