Requires iOS 5.0 or higher
and Siri capability
Add new Siri commands to iPhone 4S (Also works if you have your own SiriProxy server), like: Turn Wi-Fi/Bluetooth/etc.. on/off, change brightness to 40/# percent, what's my current battery level, Lauch app "App Name" and lot more...
Please note that this is a MobileSubstrate tweak, you won't see anything related to SiriUtils in Settings! It will just be function after respringing
See larger Screenshots below