Unable to sync my iphone with itunes over wi-fi
This might be me be being extremely dumb, but I am unable to sync my iphone with itunes over wi-fi. I have itunes 10.5 on windows, have iOS 5. When I plug my phone into my computer I have ticked the box on the device summary screen enabling wi-fi sync but when I go into my iPhone menu, the "sync now" box is greyed out and it just says that it will resume sync when my computer is available.
Any suggestions>??
iPhone 3GS