Help my internal iphone 5 speaker won't work?

My internal speaker of my iphone 5 won't work when i call someone i can't hear them but if i change into loud speaker it perfectly work fine i can hear them. What should i do?

Make sure there isn't much obstruction in there. Did you ever get it wet, or drop it. Ask Apple because it could be a manufacturing flaw, in which case they must replace it if it's under warranty. If you broke it, you're on your own, sorry.

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