How to setup an iPhone with a prepaid account

Is this how to activate an iPhone if you don't intend to use it much as a phone?

iPhone: Prepay the right way - The Unofficial Apple Weblog (TUAW)

... Buy the iPhone. Connect it to iTunes. Sign up using 999-99-9999 as your social security number. After failing the credit check, select a GoPhone plan. After signing up for a GoPhone plan and being assigned a number and passcode, connect to the AT&T GoPhone funding page as prompted, enter your credit card or debit card information and you're good to go. DO NOT attempt to fund your iPhone over the phone with AT&T. DO NOT set up your iPhone prepaid account in advance with AT&T...

Update 7/2/07: Apparently the prepaid plan can be cheaper than the cheapest fully paid plan. Estimates are about $50/month. If Apple enables VOIP services in the iPhone the prepaid plan will be very popular.