Fault Details: When we make call other person can not hear us problem, Mic not working problem microphone points on circuit damaged.
Solution:- Samsung B3210 have mic on circuit not damage without reason, Mostly microphone problem creates in this model due to water damage. So to solve mic problem first confirm that mic hole on bogy of mobile not closed or clean mic hole.
If mic problem not solved then disassemble mobile and check mic and mic points on circuit with multimeter. If mic shows zero continuity then change mic only, if points on circuit gives zero continuity then see diagram below and make jumpers like diagram.

Samsung B3210 mic problem solution-gsmhoster

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