Now you can keep your iPhone and iTunes account on your PC or Mac completely in tune wirelessly. No more hunting around for that white cable. Never again will you have to scrabble around under your desk to try to plug the USB cable into your PC.
Wireless syncing works when both your iPhone and computer are connected to the same wireless network and when your iPhone is connected to a power source. You’ll have to keep your computer on and running iTunes, too. This means that you can leave your iPhone charging overnight and wake up to fully synced iPhone and iTunes.
The more content you’ve purchased the longer it will take, but wireless sync covers everything: applications, music, bookmarks, books, contacts calendars, movies, photos, notes, documents and ringtones are all synced wirelessly over your network.
When your iPhone is connected to a power source and on the Wi-Fi network it shows up just as it would, were it plugged into your computer through a USB cable. This means you can change settings and other options wirelessly, too. Somewhat ironically, you have to plug your iPhone into your computer to enable wireless syncing, but after that, it’s all wire free.
Syncing your iPhone wirelessly to iTunes
Completely cut the cord between your iPhone and computer Christopher Brennan
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Step-by-Step Guide: Wirelessly syncing your iPhone
Taken from : The Complete Guide to the iPhone 5