These tips from Apple’s own website may help you solve the issues. We have commonly had customer’s in-store with no sound and it’s been the mute button turned on or the in-ear volume in calls turned down. Ao always worth checking these first,
See
have a look at our post on cleaning the speaker holes out to increase the sound. Simple fix
It could also be an issue with your audio IC – have a read here and see if this sounds like your phone
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