I have a Iphone 4 and a MacBook Pro. I have turned on tethering on my Iphone and I have hooked it up to connect to my MacBrook Pro via USB. It will connect; but I do not have internet. Tried to see if I had internet on the phone whilst it was tethered, and I do. I have tried to make the connection via Blue Tooth and wireless, with negative results. Hooking my phone tethered up to my wife's MacBook Air; that works. I used this phone tethered to the same computer last year whilst on holidays and it worked as it should. What could be the problem preventing from getting internet?