Will You Try To Drop Your Voice Plan Now That There's VoIP On The iPhone?

Will You Try To Drop Your Voice Plan Now That There's VoIP On The iPhone?

Justin says he has done something that many iPhone users have discussed, but haven’t been able to accomplish. He claims that AT&T let him drop the voice plan from his account, and plans to use VoIP in order to make any voice calls he needs. Is this even possible? Is it a good idea?