Want to sleep in? you'll be able to quickly shut down all your alarms on the iPhone 4S by telling Siri merely to “turn off all alarms“, Siri will then confirm the alarm modification and show you the alarm settings. Oversleeping as a result of Siri doubtless won’t be a legitimate excuse to induce out of school or work for the day, thus it’s best to avoid wasting this one for the weekend.
More useful throughout the work week, you'll be able to also tell Siri to turn on all alarms and Siri will display the scheduled alarm times