Why can't iTunes download and install iOS 7?

I can't update to iOS 7 with just my iPhone. I need Wi-Fi. So I've tired downloading and installing 5 times already in iTunes. Each time it tells me it's gonna take 25-26 hours. But when it gets to 21 hours left, a small page would appear saying "An unknown error has occurred (9006)." It's getting me frustrated. Is there something I'm doing wrong while updating to iOS 7?

You need not to download through Itunes, just go into settings and uptade to IOS7 in iphoen straightly.
BTW, you have to connect Wi-Fi first.

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