Nithi Anand sounds like your speaker needs to be replaced. [http://www.youtube.com/watch?v=XHFpa5FKHIk&feature=relmfu|This video] should help with the disassembly and the speaker is available at places [http://www.mobilephone-spares.com/Nokia-5233-Speaker.html|like this] and even [http://compare.ebay.com/like/390442966370?var=lv<yp=AllFixedPriceItemTypes&var=sbar|right here] Hope this helps, good luck.