Not able call through iPhone 7

My iPhone 7 suddenly not showing speaker button while making call.

even receiving call also not able to hear anything.

speaker is ok as i am able to hear songs.

i have restarted my phone.

also updated the latest iOS.

bluetooth handset is working. So I need to use Bluetooth device to make calls.

even audio recording is also not happening.

it seems it’s mic is stop working

please suggest solution.