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S Voice is Samsung's voice control system found on handsets, like the Galaxy S3 or in this case its Galaxy Note II 'phablet'.
Like the other systems in the test here, S Voice is well skilled in performing tasks like switching Bluetooth on or off on the phone, or sending a text message to a contact. Weirdly though, the S Voice system can't seem to send an email. You can also use it to update third party apps like Twitter or Facebook, though.
On the occasions that S Voice doesn't quite hear the instructions clearly (or correctly) it will search for the nearest match to what it heard. The system also does better than some of the others in the test with things like scheduling. For example, if you try and schedule an appointment for the same time as another that is already in your calendar, it will warn you and pop the other meeting info to check you want to schedule two things for the same time. The BlackBerry voice system doesn't do this, but Siri does.
S Voice was also one of the only other systems (in addition to Siri) to correctly put a reminder in the calendar when asked to "buy flowers on Valentine's day". It also did pretty well on the Nandos test – asking where the closest was automatically resulted in a web search, though there was no mapping result to be found.
However, asking S Voice "how to get to London Bridge" resulted in Google Navigation popping open an address box that required pressing a button to select the precise destination.
For me the voice recognition seems to be a bit hit-and-miss with S Voice: on some occasions I was impressed that it could pick up what I wanted it to do, but in others, it repeatedly got things wrong, such as when using the calculator. It also doesn't seem to understand computational function, as when it did finally recognise me telling it to add 460 to 320 it responed: "I don't know if I can answer that properly, do you want me to search the internet for 460 + 320?".