The roller key on the side will adust the volume, i am sure you have tried this with no avail, however there is a little bit more to know. If you press and hold it until it shows the volume 'chart' then you can roll up and down this will adjust volume as well but on the other 'realm' sometime these phones are programmed backwards. The scenario i gave you should increase the volume of purhaps music or videos, and just using the roller it should increase call volume.
Now if neither of these methods work then i would suggest taking compressed air to the speaker, if metal filings gathered in there it will muffle the sound considerably
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