Looks like problem is on your side. This is may due to a faulty microphone on your phone or Mic is set to be on mute.
1. Please check that nothing is clotted on Microphone. This is a small hole on bottom side of your phone.
2. Please check that other party can hear you when you're using a Hands-free / Bluetooth ear phones with mic on it. If they can hear you, when you use a hands-free, problem is with your phone's on-board microphone.
3. You can also check that, while on a call, your mic is not set on Mute. This can be done as on call, select Options
, look for Mute
. If Unmute is present, select it unmute the mic.
4. You can use Mute button Provided on the top side of the phone. While on the call, press this button to Mute / Unmute the mic. If the mic is set to Mute mode, other party won't hear any sound from you.
Hope this will solve the issue.