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what are these

I think you mean the proximity Sensor? and the Accelerometer?

I don't think you can turn them off. Don't see why you would need to anyway. Accelerometer is used for judging direction and stuff. It's how apps like pedometers work. And if you are talking about the proximity sensor. The only thing i know that it does is make your screen dark when you hold it next to your ear.
 
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