I bought nokia n73 (18-08-2007), From the day 1 it started hanging, there is no audio quality, and I gave my mobile to Nokia care 7 times , they said it's a virus problem. but i surely know there is no virus. fourth time they replace my audio system. But my handset face the hanging and reset problem. finally i gave my mobile to nokia care (14-8-08). I will raise the request for replacement of my handset.... but no response.