Why low sound from microphone of mobile phone?

When a call is sent or received from mobile phone, if the sound is very low to the other side person, check the micro phone (mic)  hole area in the mobile phone which may be filled fully with dust. If so, clean that hole area with needle type object. Be careful that the needle should not be inserted deeply inside that mic hole which will damage the microphone permanently.

Most of the mobile phones will have micro phone hole in the bottom area. Some mobile phone pictures are shown above, look at them.

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