i have purchased samsung mobile phone(metro gt s3310)from 3g mobile world calicut on29/08/2009.It worked properly for one month . after that it got a hanging problem.i had given my phone to authorised samsung mobile service centre(GEM CARE SERVICE CENTRE)at calicut .they said that it is required to change mother board .they changed it .after one week the hanging problem repeats again.then i take the phone to service centre .they said that it is required to change the keypad .they changed it . the hanging problem stops but i cant call from my phone , a whistling sound appears causing disturbances. again i given my phone to service centre . they again said they need to replace key pad. my phone is on service sender now(19/11/2009)