My iPhones sound won't work

Okay so my sound first didn't work awhile back but randomly one day it started working again but it stopped again and I don't know how to fix it:/ the sound doesn't work except for Siri and it works if I put earphones or speakers in and whenever I try to turn my ringer up it doesn't show any of the notches for it

In iphone3g the charging jack, mic and loud speaker connect through one jack on chip.
if your phone is not charging. It may cause of jack remove

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