SAN FRANCISCO — Siri may not be the "intelligent assistant" Apple promised, but a would-be class of iPhone 4S users will have to make a stronger case to get the technology giant on the hook for damages.

U.S. District Chief Judge Claudia Wilken in Oakland dismissed a consolidated class action brought against Apple over its marketing of Siri, a digital assistant feature embedded in the iPhone 4S. Plaintiffs claim they were persuaded to buy the new phone by the advertising blitz trumpeting Siri only to find the feature fell far short of Apple's promises. They seek damages for the money they shelled out to buy the phones.