There could be several reasons why your phone speaker is not working during calls. Here are a few things you can try:
Check if your phone is on silent mode: Sometimes, we accidentally put our phone on silent mode, which can cause the speaker to not work during calls. Make sure your phone is not on silent mode.
Check the volume level: Make sure that the volume on your phone is turned up. You can increase the volume during a call by using the volume buttons on your phone.
Check if the speaker is dirty or obstructed: The speaker on your phone may not work properly if it is dirty or obstructed. Check if there is any dust, dirt, or debris blocking the speaker. You can clean it using a soft-bristled brush or a toothbrush.
Restart your phone: Sometimes, restarting your phone can fix the issue. Try turning off your phone and then turning it back on again.
Check if there is a software update available: Sometimes, a software update can fix bugs that cause issues with the speaker during calls. Check if there is a software update available for your phone and install it if there is.
Visit a service center: If none of the above solutions work, there may be a hardware issue with your phone's speaker. Visit a service center to get it fixed.