After working wonderfully for about 3 years, the 7610 seems to have shut off the microphone. When I make or receive a call, I can hear the other party, but they cannot hear my voice. When I change it to Loudspeaker, same thing. It seems like the phone thinks I have plugged in the headset, maybe? The only thing I tried differently, lately, was using a different charger to charge the battery. It wasn't a 'Nokia brand' charger, but it was for 'Nokia phones.' Is it possible that by using this charger, it has changed such that the phone believes a headset jack has been placed in, so it shuts off all microphones? Kindly advise me on this, thanks a lot. Alan