ITunes sync icon rotating in left corner for no reason on my iPhone 4S?

I'm on ios 7 beta 5 and it keeps spinning and I'm not even syncing anything

You could be on Wi-Fi sync or it may just be iOS 7 because its still in beta

Is your UDID registered? A lot of people have been reporting problems like this when they install iOS 7 without registering their device's UDID with a developer account through a site like http://www.udid.in/.It's $5, and they literally registered my 4S instantly.