In an unusual move, AT&T has issued an official response to Verizon’s recent attack ads, which led the iPhone carrier to file a lawsuit against Verizon last week. “As the U.S. market leader in wireless data service, we typically don’t respond to competitors’ advertising. However, some recent ads from Verizon are so blatantly false and misleading, that we want to set the record straight about AT&T’s wireless data…