Can't hear the person I'm talking with iphone 4?

I have my iphone like 6 months now and when someone calls me, they can clearly hear me but I can't hear what they say from my receiver. No sound at all. When I turn on the speaker, I can normally hear them. Earplugs work as well. But why can't I hear them from my receiver?

Something probably happened i suggest if you are near an apple store take it over there but save your data first they might restart the iphone

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