My iPhone 5 is really quiet when making calls?

Recently my iPhone has been really quiet when I'm on the phone. If I ring someone or they ring me I can barely hear what they are saying. Its only been like this for the last few weeks it was fine before then. All other sounds are loud so the music plays fine and my ringtone/message tone etc is all fine. So does anyone know why or how I could fix it? All help appreciated:-)

Haha…
Your phone is broke haha

While you are on the phone talking to someone (Or Something LoL) Turn up the volume.

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