Why has my IPhone 4S speaker stopped working

I've noticed my phone has gone quieter, and I have realised that my left speaker has stopped working! I've only had it for three months!
This happened on my old iPhone after having it a year however I was dew an upgrade so didn't think anything of it.
Does anyone know why this has happened and if I can fix it or weather ill have to take it to get repaired?

If it has been dropped then the connection might have came loose.take it to a shop to fix or take it apart yourself.depends how good you are with technology. If its on a contract the cpompany who give you the phone should fix it if you ask them.

First of all iPhone 4s have only one speaker, not a left or right. On the right its speaker and on the left its mic. You can check the speaker volume in settings or try a reset for settings only because you don't want to loose any data.

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