After swapping out 4 different USB cables, (no way all 4 were bad) I found that by plugging the cable into a USB port on my Mac keyboard or directly to the Mac, iTunes then recognized my iPhone.
Evidently, after updating the iPhone to ios 6.0.2 it did something to the iPhone that does not allow my powered USB hub to see my iPhone and therefore iTunes does not see it. But by using the Mac USB ports it recognizes the iPhone.
As a test of my USB hub, I plugged in an iPad 3 with ios 6.0.1 into the USB hub and iTunes still recognizes the iPad. The problem is related to the ios 6.0.2 update in the iPhone.
Something that needs to be fixed in the next iPhone ios update?
I have got the same problem but i can't charge my iphone on my mac anymore... So i have the same problem as my ipad. It used to charge but 6.01 not anymore. Now the same with my iphone... What is going on with apple... I have been using macs since 1995 and recently i feel like their updates are worst and worst...