Need loud speaker to be able to talk, mic problem

[PhaseCoder]

Hi I have recently come into owning a AT&T ni717, now the charger port is a bit iffy and does need replacing.

But when i have a normal call, the microphone doesnt work so they cant here me speaking, unless i go to loud speaker.
but if i place my mouth around the little hole and speak they can here me, its weired because
i tried sound recorder and it seems to work fine, just not in call???

Has anyone experincd this and been and been able to solve it?

thanks in advbace