[AC Question]

I will see that I am getting a call when I answer it they can't hear me I can't hear them if then I restart my phone 3 or 4 times and it works

[B. Diddy]

Welcome to Android Central! Which phone? Have you discussed this with your carrier? They might want to try a replacement SIM card.

Also, try booting into Safe Mode, which temporarily disables all 3rd party apps. On most Android devices, while powered on, press and hold Power until the Power Off menu appears. Press and hold the Power Off selection until the Safe Mode prompt appears. Tap OK.

If the problem disappears in Safe Mode, then something you installed is causing the problem. You may have to uninstall apps one by one until the problem disappears. If the problem persists in Safe Mode, then it's more likely to be a hardware or firmware problem.