Just tell him to get a sprint blackberry and get one of the bluetooth adapters that clip to the visor a heck of a lot cheaper...not that hes worried about that i bet and will be guaranteed to work. and from what ive heard they work pretty good.
RadioShack.com - Phones & Radio Communications: Accessories: Wireless phone accessories: Headsets & speakerphones: Motorola HF820 Bluetooth® Speakerphone Car Kit