How much data do you use?
They know what they are doing, however
Some people have had the plan added
months after tethering just once.
Is she set on having a contract with ATT? How much data and talk does she need? There's always prepaid...and they can't really add a tethering plan to your plan
I have internet sharing enabled on my Samsung Focus and it was really simple to WindowBreak it and get that up and running. No custom ROM needed, plus I have the 8107 update. And after my experience with Windows Mobile, I am averse to modifying phones