Why can't I nor the person on the other end of the line hear each other when making a call on my Samsung Galaxy S III?

Sir i have  s3.i m not hearing voice during calling nor my voice is listend by other person.but music ,tunes are heard. so whats the problem?nd what should i do?

I have also shown my phone to samsung service station of my city.they didn't caught the problem.

Hi karan. It looks to me that it's your phone's mic and earpiece that has an issue. You can contact Samsung directly to find out where you can send your phone for repair.

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