Problem during calls!

when i am in a call the following issues appear-
1. a dim red light close to the speaker blinks continuosly during the call(is that a sensor? i dont know)
2. a small distortion or noise is heard.
3. the screen blacks out. ( i tried covering the light and then uncovering it and then sometimes the screen would lit up and i could use the functions, but most of the time its justs blank and unlit during the calls.
What is this??
Please help.

Where do you see this red light... is it the red LED at the top right of the 9720?
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