said by Matt:said by kamm:said by gdm:My guess is expect it to be an additional $20 to 30 ontop of the data plan for the iphone.
That would make it the
most expensive cellular data service *EVER*!

And this is in the year when flat-fee unlimited data services are rolling out...
No, it wouldn't. An iPhone data plan is $30 so that would make it $50 or $60 to tether. Verizon's data plan is $45.99 + $15 to tether, or $60.99.
And AT&T charges from $15 to $30 extra for some other smartphones & PDAs to tether based on this web page: