Can't hear people after display replacement

Ok, i'm just embaraced, cause this is an undead issue. I even clicked on the "sucess" link, after following the steps over the "display assembly replacement", one week ago, and had some answers from you guys, that helped me sucessful, when i questioned the problems i was having. So, the thing is that i haven't tested a phonecall, after i done everything right. Changed the lcd screen, changed the digitizer, input a reset on the iphone, it started, everything ok...until...i make a phone call. People can ear me, but i can't ear people. Only with loud speak activated. What can it be??? Any sugestions???