SiriToggles Cydia tweak enables iPhone 4S users to control brightness, app launching, shutting down their iDevice, toggle system settings including wi-fi, bluetooth, cellular data etc. integrating with Siri.
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SiriToggles also works for any iDevice older than iPhone 4S having Siri port.
You can download SiriToggles for iPhone 4S free through Cydia under BigBoss repo.