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I hate to sound obvious but have you checked the volume setting? Took me a few days to realize they were there - I almost never read the manual. :) The two volume keys are on the left of the phone as you look at the screen. Hope this helps.
First check and adjust call volume. It should set be optimal and secondly during a call adjust the microphone volume.
If this is ok and the problem exsist then the microphone, speaker or some other hardware need to be replaced. Contact local hardware expert.
You say that your Settings; sounds and notifications, are all checked off, and volume slider is turned up. If you still don't have any sound from your speaker, plug in in your earphones and see if you hear anything. If so, you have a bad speaker or device problem. If you still don't hear anything with headphones, then ditto. Contact Tech Support for exchange.