Cortana vs S Voice


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Cortana
Cortana is your personal assistant on your Windows Phone. She's there to help make things easier for you and keep you up to date on the things that matter to you. Whether it’s to keep you looped in with your world or help you manage your everyday life, Cortana is there for you.
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S Voice
It responds to you: you can tell the phone to wake up, answer an incoming call, or even take a photo. It waits till you're asleep: the screen maintains a bright display as long as you're looking at it.