An iPhone 4S buyer has filed a lawsuit against Apple in a California court complaining that Apple delivered less (than what it promised) with automated  the Speech Interpretation and Recognition Interface better known as Siri on iPhone 4s. Siri is the voice-activated assistant software in its smartphone, reports Reuters.

Frank Fazio, who filed that suit, lives inNew York City,Brooklyn.

Fazio’s lawyers want the case to have a class action status and represent all the people who bought iPhone 4S – the latest iPhone model from Apple.

The advertisements of iPhone 4S showed people asking Siri to help them find restaurants or a rodeo in town. Fazio, disappointed with the actual performance of Siri, considers it as “intentional misrepresentation” and unfair competition.

Siri has been referred by some experts as a direct challenge to Google’s search engine. The software is expected to understand context of sentence spoken by a user. It also helps users make calls, send email, make notes, and much more. It is also able to do mathematical calculations for the users.

However, according to Fazio lawyers, Siri claims were “misleading and deceptive.”

“Promptly after the purchase of his iPhone 4S, plaintiff realized that Siri was not performing as advertised,” said Fazio’s lawsuit. “For instance, when plaintiff asked Siri for directions to a certain place, or to locate a store, Siri either did not understand what plaintiff was asking, or, after a very long wait time, responded with the wrong answer.”

No official response has been received from Apple regarding the pending litigation over Siri.

Siri on iPhone 4s: Has Apple delivered what it promised?