SAN FRANCISCO — A federal judge has tossed a class action filed by consumers who claim the iPhone’s personal assistant feature, Siri, did not live up to Apple’s promises.

In an order issued Friday, U.S. District Chief Judge Claudia Wilken granted Apple’s motion to dismiss the suit without leave to amend. Plaintiffs in In Re iPhone Consumer Litigation, 12-1127, claimed that Apple’s advertisements led them to believe that Siri could consistently respond to questions and commands. They were sorely disappointed with the feature once they purchased their phones.