Solved No One Can Hear Me When I Call Them Blu Phone

Chosen Solution

It just happened everything works great except no one can bear me if they call or I call

Check the hole for the microphone in the bottom of the phone , they can get clogged with dirt if its clear then you have a microphone issue and ifixit has a tutorial on how to fix it here Blu Studio HD 6.0 Microphone Replacement Hope this helps and good luck