With ITunes, you can transfer content from your computer to iOS devices -- the iPhone, iPad and iPod Touch -- to keep them synchronized. To sync an iPhone with iTunes, connect the phone to your computer with the iPhone connection cable and then select the music, apps, books, videos and other content you want to transfer. If your computer and iPhone share a Wi-Fi network, you can enable wireless syncing to transfer content.
Connect the iPhone to your computer using the iPhone's USB cable.
Open iTunes on the computer if it does not open automatically when you connect the iPhone. If you don't have the latest version of iTunes, you can download it free from Apple's website.
Select the iPhone on the list of available devices in iTunes. Devices are listed below the LCD and playback controls near the top of the window in iTunes 12.
Click the "Summary" tab on the left of the screen and place a check mark in the "Sync With This iPhone Over Wi-Fi" check box to enable Wi-Fi syncing. The iPhone will sync content automatically when it is plugged in to a power source and when iTunes is open on the computer. Skip this step if you plan to only sync with a USB connection.
Select the tab corresponding to the type of content you want to sync. Content tabs are listed along the left side of iTunes. Depending on what content is available in your iTunes library, tabs might include Apps, Music, Movies, TV Shows, Podcasts, Books, Audiobooks, Tones and Photos.
Place a check mark in the Sync check box found at the top of the selected content page. If you selected the Music tab, for example, place a check mark in the Sync Music check box.
Click the "Sync" button in the bottom-right corner to sync the selected content to your iPhone.
Depending on the content tab you select, you can customize sync settings. If you select the Music tab, for example, you can choose whether to sync your entire music catalog or only certain music. If you select Photos, you can choose whether to sync images from certain applications or from individual folders on your computer.
With Wi-Fi syncing enabled, your iPhone appears as an available device in iTunes whenever it’s on the same network as your computer.
If iTunes won’t recognize your iPhone, take a moment to troubleshoot the connection. Restart both your computer and the iPhone. Make sure you have the latest version of iTunes. Verify that your USB cable is firmly connected to both devices.