If someone calls they can hear the phone ring but when i awnser they ca't hear me talk. If i talk really loud they can kind of hear me but is sounds like i'm far away. I have a voice recorder, i tried this too and when i press "replay" i cant hear anything. Nothing has happened to my phone it just started.
SOURCE: No sound when phone slider up
This is because when the slider is Up then according to the default settings you are using the phone so it donot ring... just shows the displAy... so don'y worry your phone is Ok.
The problem with your phone is that the earpiece of your phone is bad, that is why you cannot hear anything while you call or if you are called.
All you need to do is to change the earpiece of your phone and you will see that after changing it, you can hear when people call or when you are called.
Replace the earpiece as said and you will see that your communication with other people on the phone will move smoothly.
Usually answered in minutes!