My iPhone 5 has a strange hissing noise?

Its very quiet and you can't hear it unless you put the speaker on your ear. It only happens when i record a video or make a voice memo and on certain apps. Is this a hardware problem or software? Its very quiet btw.

Odds are its software. With new updates in iOS it will probably be fixed. But you could go to an apple store and have it replaced for free

It is white noise to equalize the microphone. This is normal.

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