The iPhone is a Bluetooth-enabled smartphone that features a built-in Contacts application that allows you to organise and view contacts on your iPhone. You can sync the information from your iPhone's Contacts application with the information in your computer's contact management system through Bluetooth. The Contacts application can sync with Windows Address Book, Outlook Express, Microsoft Outlook 2003 and 2007 and Yahoo! Address Book.
Tap the "Settings" icon on your iPhone and select the "General" option.
Select "Bluetooth" and move the switch located to the right of "Bluetooth" to the "ON" position.
Click the "Start" button on your computer and select the "Control Panel."
Click the "Add a Device" link under the "Hardware and Sound" subsection.
Click the "iPhone" icon to select your device and click the "Next" button.
Compare the pairing numbers listed on your computer and iPhone and select "Next" on both your computer and your iPhone.
Double click the "iPhone" icon on your computer.
Select "Contacts" to sync the contacts on your iPhone with the contacts on your computer's contact management system. Click the "Next" button.
Wait while your iPhone syncs contacts with the contact management program on your PC. Your iPhone will prompt you when the process is complete.