Cannot tether iPhone to macbook via USB
I am currently using a macbook white classic (A1181) running 10.5.8.
I have an iPhone 4 running 6.1
I am trying to tether my phone to my computer via USB, but it is not appearing in Network Preferences list. When I click the '+' symbol, there is no option to add an 'iPhone USB' interface.
My mobile provider does permit tethering and it is active.
This is supposed to be possible on 10.5.8 and I have the latest version of iTunes.
My phone does work via wi-fi, however downloads are not completing fully and I wish to see if there is any improvement if I connect it via USB.
MacBook, Mac OS X (10.5.8)