Hi, When I talk on the phone I can't hear nothing in the speaker i must put it on the loud speaker to hear the other person. thank's

mobile phones has two speaker one is used for hearing music, ringtone etc.. and other is used to communication if u cannot hear the voice the communication speaker is problem or network problem ......u can used through loud speaker option while communication or visit the nokia showroom

Do the loud speaker works well ? If yes the only thing you need to do is to change the Earpiece (ear speaker).You can contact mobile repairing shop.Thanks for visiting fixya

Your mobile hardware needs repairing.
A problem in the speaker ..it needs to be changed

your speaker is blown. if you can put it on speaker phone and hear it is your speaker and you should just get a new phone or have it replaced if it was not your fault, but a faulty phone.

It sound like the speaker us gone can happen in any phone send it to nokia and they fix it for free There r two speaker a loud speaker for playing movie and music, And the other is for hear people when ur talking

hi aubreeloo22 and welcome to fixya,

Try to replace your earphone and then switched off and on your phone before using the new earphone, If same problem arise you should bring it to your service provider to check the phone.
thanks and have a nice day

When you talk on you phone make sure your volume label is up. There is a key in right hand site on top. Press up / down for adjusting the volume. if you seen the volume label is fully up but nothing to be change in voice, its mean the internal speaker is damaged. Replace it. And about your voice is not loud from other side then replace that microphone also. I think that's a common problem of Nokia N73 mobiles.
Thanks

try resetting its settings to factory setting or try reformatting it.

That person can use the headset or loud speaker

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.