The micro phones are also called mouth piece as it transfers the caller voice to the person who is being called. The microphone is on the sender side. A damaged microphone cannot send the senders voice to receiver. This problem makes it one way communication that is poor communication. If you are facing an issue of pure communication do call us at 04 4211494 to activate the free pick and drop service or email to us at email@example.com . our technicians are the best in the market to handles any fixation related to blackberry Z10.