When on speaker phone - incoming volume

Make sure your speaker on device is clear and set your incoming volume up or speaker volume. ......you can also go to playstore and search repair speaker volume apps

they have a separate speaker for music and speaker phone , that speaker is faulty and needs to be replaced

I don't now

When you cannot hear the other party talking usually this can be attributed to 2 things. The first being the volume of the unit in question you can always refer to your user guide on how to increase the volume. if after increasing the volume you still cant hear then the speaker of your unit is bad and needs to be replaced. This can always be done by any phone repair personnel.
Hope this solution has been helpful?

First of all make sure the volume is high. Try talking in speakerphone mode. If you can hear in speaker phone mode, then your ear piece might be not working.

This is may be due to oblivious falls which happened before. This causes damage to the speakers and microphones inside.

Patrick -
I have the reverse problem.  Callers can hardly hear me. I saw a setting in the headunit that allows you to specify where the audio plays for incoming calls.  You can choose the Left Front Speaker, the Right Front Speaker or Both.  Check the manual and make sure its set to both.
Regards, Charlie

Seems your ear speaker has a problem. It need to be changed.

dude open your and remove the battery..clear that section and blow into the speaker it will work

This cause when your phone talk speaker has some problem this problem is known in samsung one of my friend has simillar problem with his phone.