What you posted is of interest to me. My high speed dsl at home is not working. My wife and I have a couple of Mac laptops with wireless capability. Exactly how would we go about hooking up the iPhone to the laptops and use the phone as the router? I would really like to know how to by-pass the dsl/router.
Well, you should investigate more because not only is setting up tethering specific for each phone but for each carrier. And I don’t really know how they do it for the Macs :-)
I checked around the ‘net briefly and found and article that says AT&T does not allow tethering with the iPhone. But then I found this article that explains how to do it - http://reviews.cnet.com/8301-19512_7-10265889-233.html
I can only suggest to poke around some more, maybe find a board where other people have done this. Or just try the link I gave above and see if it works.
I also would suggest though that if you get it working you only use it lightly because depending how much AT&T is really against tethering they may just turn off your service if they notice you doing some heavy duty surfing over a period of time.
I pinged Swordmaker as he may have run into this before with the Apple equipment.