I want callers to hear an on phone beep when I am on my phone. My new Kyocera flip phone just rings and rings and callers do not hear a beep letting them know that I am on my phone.

SOURCE: Can't hear caller

This problem often results from a defective handset cord--check the handset cord by switching it with a good one. If that solves the problem, replace the cord. With a portable phone, substitute a transmitter from another telephone--replace if necessary.

SOURCE: Phone rings but when answered the caller can not be heard.

Your ear speaker is bad. You may need to replace it.. This one made by HTC. You can check on Ebay for replacement part. Other issue could be is the hardware part of the ear speaker may be broken or defected will cause loosing contact with the main circuit or you can say it is short. Only solution is open the phone and check for that area to see for any defective.

SOURCE: problem with heaing incoming and outgoing calls unless using speakerphone

I can't hear people that call me unless I put them on speaker phone. Called Motorola and they had me reset the phone but that did nothing. Any other suggestions?
Thanks.

SOURCE: Voice caller cannot hear me but I can hear them

Problem is in phone's microphone. Take it to a service center.

SOURCE: Blackberry Pearl Sound

Assuming you have the audio volume turned up, do you have a bluetooth headset? Check the Bluetooth options to make sure there are no associated bluetooth devices (or just turn bluetooth off).

If that still doesn't work, try clicking the trackwheel and seeing if it says "Mute" or "Unmute" respectively.

If you still can't hear the callers voice, you may have a defective earpiece in the phone and it's time for repair. If you don't have a bluetooth headset, you can try to use one of those to hold a conversation. I have my bluetooth headset around my neck at all times, I can't stand talking without it. As an added bonus, people who can't see my earpiece in my ear thinks I'm talking to myself.