The default settings for iTunes automatically detect any iPhone connected to your system so that iTunes syncs the device automatically. This is performed via a service that runs in the background to automatically launch iTunes and begin the sync process. You can disable this functionality manually within iTunes. To restart automatic syncing of your iPhone, you must change your basic configuration settings. You can also manually sync your iPhone if you prefer to leave the automatic syncing function disabled.
Configure Automatic Syncing
Connect your iPhone to your computer and launch iTunes.
Click the "Edit" menu on Windows or the "iTunes" menu on a Mac. Select "Preferences" from the drop-down menu.
Click the "Devices" option.
Uncheck the option to "Prevent iPods, iPhones, and iPads from Syncing Automatically." Click "OK."
Click the "iPhone" button and check the "Automatically Sync When This iPhone is Connected" box.
Click "Apply" to apply the settings and sync your iPhone.
Launch iTunes with your iPhone connected to your computer.
Select the "iPhone" button in iTunes.
Select each of the tabs and choose the apps, movies, music and other content you want to sync to your iPhone. For example, you could select the "Music" tab and check the option to "Sync All Music."
Click the "Sync" button to begin syncing your device.
Information in this article applies to iOS 6, Windows 8 and Mac OS X Mountain Lion. It may vary slightly or significantly with other versions or products.
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