[Android Central Question]

Are the two things related? I must have my call on speaker phone otherwise the person who is called cannot hear me

[Rukbat]

They're probably not, if the speakerphone works. Take it to your carrier and tell them what the problem is so they can call you and hear it for themselves. (It's possible that the phone mic, the one at the bottom next to the microUSB port, went bad at the same time that notification started showing up. Or that hole could be clogged with lint and dust. Use a strong light to see into it and if it's full of lint, use a thin pointed wooden toothpick to clean the hole out.