How do I sync my iPhone to iTunes over a Wi-Fi network?
The iPhone needs to be running at least iOS 5 (the latest version of Apple’s operating system for iPad, iPhone and the iPod Touch), and iTunes 10.5 or later should be installed on the computer. If you have not upgraded your software lately — and both your iPhone model and computer can support the newer programs — you should be able to get the latest versions with the Apple Software Update program on your Mac or PC.
Once you have confirmed that your iPhone and computer meet the system requirements, connect the two with the USB cable that came with the phone. When the iPhone icon appears in the iTunes Devices list, click it, and then click the Summary tab at the top of the iTunes window.
On the Summary screen, scroll down to the Options area, click the checkbox next to “Sync with this iPhone over Wi-Fi” and click the Apply button. You can now sync content like music and video from iTunes to your phone without having to link the two devices with the USB cable. The iPhone’s icon remains visible in the iTunes window, even when it is not physically connected to the computer, so you can transfer files as you normally do with iTunes.
In order to sync over Wi-Fi, you do need to have iTunes open on the computer, have the iPhone plugged into a power source and have both the phone and computer connected to the same wireless network. Apple has troubleshooting tips if you have problems.