People can't hear me on my Samsung Galaxy S3

When I send or receive a call, the person on the other side can't hear me.

Sometimes, the microphone goes mute during the call. But when I check if the phone is on mute, but it isn't. It happens randomly.

The microphone seems to be OK, and I think this is probably a software problem. Would upgrading the OS (from ICS to JB) fix this?

Source: http://android.stackexchange.com/questions/35834/people-cant-hear-me-on-my-samsung-galaxy-s3

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