When I make a phone call I cannot hear anything.

You may have the privacy mute turned on, the one which allows you to say rude and insulting asides to someone next to you and the other party on your phone can't hear that.
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Replace the flip assembly, the ear receiver is dead and thats why you cant hear, replace the flip and you'll be fine, its not expensive and this is a common issue with motorola flip phones.

Hello,

The problem why you cannot hear the person you are talking to with the one at the top front(the main earpiece) is that the front earpiece of your phone is bad that is you cannot hear anything unless you put it on speaker.

All you need to do is to replace the front earpiece of your phone and you will see that you will hear when you are talking to anyone.

Change the front earpiece as advice and you see that you will hear your conversation when calling or receiving calls.

Take care.

In this case check the volume of you're Handheld, If it is low, Increase the volume and check still if it is not working you need to walk into the service center to check the speaker of you're Handheld.

Hi,

This is a hardware problem. Try to remove the battery and plug in after some time. If that fix it,it' great unless you need to send it for repair.

It might be a issue with IC's, might be blown or soldered out or might be the microphone in the cellphone might needs a replacement/repair.

Thanks for using "Fixya".

the ear piece may be dead or if its a flip phone check the flex cable

like omg..

I would suggest you to send your phone in for repair or call technical support whatever carrier that your phone goes by

dear replace the speaker of ur phone in k300 the speaker and ringer are the same if u not have new speaker then short both point of the speaker to gather will be ok.