Nokia xpress music 5310
Egarding vibration and sound

THERE IS NO VIBRATION MODE WORKING DURING INCOMMING CALL AND ALSO SOUND IS NOT CLEAR SINCE 15 DAYS AS LIKE BEFORE.I WAS BOUGHT THIS SET JUST 3 MONTH AGO FROM AUTHORISED DEALER IN PATNA.I AM VERY FRUSTRATED BECAUSE I AM NOT ABLE TO GET THE CALL IN MY OFFICE DUE TO VIBRATION IS NOT WORKING.

PLEASE GIIVE ME SUGGESTION AS SOON AS POSSIBLE THAT WHAT I SHOULD DO?