Why my phone sounds only working through headphone?

[Android Central Question]

Every time I make a call the receiver can't hear me but I can heard them..and no sounds coming out on my video recording..

 

[B. Diddy]

Welcome to Android Central! Which phone? Can they hear you if you use a wired or Bluetooth headset? If so, then your phone's primary mic is either blocked (e.g., by lint) or faulty.