My I Phone 4 keeps putting me on hold or mute or hanging up on me from my face touching the screen. returned one phone and now my replacement is doing the same thing. this is crazy. my iphone 3 didn't do this!

My I Phone 4 keeps putting me on hold or mute or hanging up on me from my face touching the screen. returned one phone and now my replacement is doing the same thing. this is crazy. my iphone 3 didn't do this! the screen is suppose to turn black when it is near my ear so that you can not do this and then turn on again when you pull it away. This phone is not doing this. 

Are you using a case around your phone? If yes, did you make sure the proximity sensor is not covered?
Try without the cover to make sure the sensor is working.
A protection film on your screen can also cover the sensor and result in a dysfunction of the sensor.

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