"I can hear people but they can't hear me!"
If your iPhone 4/4s/5/5s mic has suddenly stopped working during calls (this means its still works in voice recorder), try this fix. Its quick and easy and will take less than 5 minutes. You need simple tools you can either purchase online or find around the house. I hope it works for you as it worked for me.
NOTE:
PLEASE be careful using the box cutter blade! If you are under the age of 14 you should probably ask an adult to assist you with removing the screws (if a screwdriver is unavailable)
GOODLUCK! and thanks for watching.