I need help on my LG G3 I can't make calls out or take incoming calls??

[AC Question]

Can't make or receive incoming calls.... have to have it on speaker to talk or anewer it. I have No idea as to why? It just happened. Been like this for about 3/4 months. ANY idea's?

 

[the tall guy]

You have a mic hardware issue - check the phones mic to see if you have some some dust / sand blocking it.