Screeching Sound During Calls

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i purchased iphone 4s in october , absolutely love it, running strange technical problem.

people on other line tell me hear terrible screeching sound or chirping during calls. no not hear on end.

took phone apple store last week , replaced it. unfortunately, replacement model doing exact same thing. problem occurs , without wifi turned on, in indoors , out, low signal or full 5 bars. it's seemingly random.

has problem happened else? , if so, did pinpoint cause?
 



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