Sync your device over a Wi-Fi network
If you’re on a Wi-Fi network, and have iOS 5 (or later) installed on your iPod touch, iPhone, or iPad, you can sync your device without connecting it to your computer.
When you sync over Wi-Fi, your device uses the same sync settings you chose for syncing over a cable.
Turn on Wi-Fi syncing
Connect your iPod touch, iPhone, or iPad to your computer and select your device.
Select “Sync with this device over Wi-Fi.”
Disconnect your device from your computer.
Your device still appears in the Devices pop-up menu in iTunes unless you click the Eject button .
If you click Eject, your device is removed from the Devices pop-up menu, but Wi-Fi syncing remains turned on. Your device reappears in the Devices pop-up menu the next time you open iTunes.
Sync your device over Wi-Fi
Here are ways to sync wirelessly when your device is on the same Wi-Fi network as your computer (the computer must be turned on):
Connect your device to a charger and plug it in to an electrical outlet.
Syncing begins automatically.
In iTunes, click the Devices button to choose your device, and click the Sync button.
If you sync the device manually, click Add To , drag items to the pane on the right, and click Done.
On your device, go to Settings > General > iTunes Wi-Fi Sync, and tap Sync Now.
You can use your device while it’s syncing over Wi-Fi.
To restore your device’s software, connect the device to your computer.
You can sync a device wirelessly with multiple computers, but each type of content can be synced with only one computer.
Syncing over Wi-Fi is slower than syncing over a cable. If you connect a device to your computer while syncing over Wi-Fi, syncing continues over the cable. If you disconnect a device’s cable from a computer while syncing, syncing stops, even if Wi-Fi syncing is on.