Barrons reports on a recent analyst note from Oppenheimer which claims that AT&T is discounting the iPhone by $325 to reach its $199 (8GB) and $299 (16GB) prices. This means the actual unsubsidized iPhone cost would be $524 and $624, respectively. The higher subsidy rate for the iPhone, he says, reflects AT&Ts faith in the iPhones ability to attract new subs and increase ARPU. And he also says it