Actually, you can't even make a call without a data plan, since you can't register the G1 with Google's servers, and thereby cannot escape the initial setup wiz

Actually, you can't even make a call without a data plan, since you can't register the G1 with Google's servers, and thereby cannot escape the initial setup wizard. I know this because I paid full price for a G1 w/o contract, and had to wait 48 hours for my data service to be activated after I bought the phone. (T-Mobile's contract-less service is slightly less crappy than most carriers', but still has some horrible problems, like not being able to change service terms mid-month under any circumstances.)