I have purchase Samsung J600 mobile in December-2007.After purchase of 2 week it start giving me problem by getting automatic switchoff. I had visited Samsung service centre and get it resolved.But after 2 month of proper working its speaker got damaged without any reason. Again i got it rectify.But after 10 days again speaker got damaged. Iam really very much frustated.I want someone to look after the quality of cell phone and norms to get rid off frequent problem face by consumers.