Siri helps Apple sell 30 million iPhones in Q4, shares could hit $510 (analyst)

Analysts believe Apple is on target to sell 30 million smartphones by the end of the December quarter, beating previous estimates of 28 million phones. Sales of the highly-anticipated iPhone 4S have no-doubt been fueled by Siri, the voice-powered virtual assistant, which appeared in mid-October on the new Apple smartphone.