Hi,

I had problem with my Nokia 5800. When I called some one or some one called me , I can't hear the other side and i had to use loud speaker or handsfree....
I've found the solution to fix it ! Softwarely !

go here :
Menu
Settings
Connectivity
Network
Network Mode

Your network mode is "DUAL MODE" select GSM ...
and save it , wait around 10 second and call some one/ask some one to call you!
You see its resolved now :D
I checked it in 3 5800 and they all is ok NOW


Post the result here !! ENJOY

:goodluck: