...Tethering is prohibited on the iPhone plan so be prepared for your service to be dropped or you to get a massive bill when AT&T finds out. The only plans that allow tethering are $80/mo and up for the data. You can bet on a $20 data plan for a phone that has no ability to tether, they're going to be watching for overuse like this. Seeing as the iPhone plans are so cheap because you are not accessing the 3G network, a lot of 3G useage could get you in deep with AT&T.
I was wondering about this. As is typical for most people, I didn't bother fully reading the details of my contract. Where does it specifically prohibit tethering?
As mentioned in another thread, I used to tether to an old Siemens S56 over GPRS for free (yes, it was slow, but it worked fine for email). Cingular specifically told me it was OK to do. I'm on the same family plan, except one line was upgraded for the iPhone. I suppose there could be new limitations because of that.
I'm eligible for a "free phone", so I was thinking of picking up a refurbished Samsung SYNC for $20. I'm tired of paying $10/day for broadband access while traveling.