Why isn't my voice coming through my ihone 5 when I call someone or ask Siri a question?

I have tried restarting it by holdin in the power button and home button at same time but it still doesnt work and Ive tried without my case. I dont k

I have tried restarting it by holdin in the power button and home button at same time but it still doesn't work and I've tried without my case. I don't know what else to try plz give me ideas

or:I have tried restarting it by holdin in the power button and home button at same time but it still doesn't work and I've tried without my case. I don't know what else to try plz give me ideas

or:probably because your microphone is broken.

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