Radio Shack is also giving any T-Mobile phone away the same day, but they are not requiring a family plan setup and they are waiving the $35 activation fee.
Keep in mind you may still need to pay something for the phone at the counter and file a rebate claim for the amount paid. Yeah, I know it is a pain, but as far as rebates go, I've never had trouble with any cell phone rebate before.
Head over to T-Mobile's website and see if they have anything you, I mean your dad, is interested in. They have the HTC HD2 running Windows Mobile 6.5, the new myTouch 3G Slide and half a dozen other Android phones, Blackberry and more.