I have been having issues with the in-call audio on my Z10. When I hold the phone to my ear, I can barely hear the other end and end up putting it on speaker phone.
Has anyone had a similar issue or is there a setting I can change? (I have tried looking through, but seems like everything is normal)
When did it start happening? Or has it always been that way?
Maybe a OS you installed?
Did you check your master volume setting?
Or maybe your headphone jack is messed up. Try plugging in and out a headphone connector several times to see if that loosens any bad connections up.
If you have not gotten the anything in the earpiece (water, Kool-Aid, etc) and the volume is turned up (while in a call, click the side volume button up), then you might have a hardware issue. I've read several things on this and for some, it's been a blown speaker.
Try this too: Click on the phone icon. Now swipe down from the top. Now check your "Call Audio" settings.
Works fine for me, what Blackberry 10 OS version are you currently on?