Why is my iphone volume quite?

Whenever i talk to someone using voxer or facetime my voice is really quite to everyone else. I can't find the problem and my volume and other peoples volume are all the way up

I think you mean quiet?

MICROPHONE VOLUME OPTIONS
STEP 1
Tap "Settings" and "Sounds" on your iPhone.

STEP 2
Slide the "Change With Buttons" slider to the "On" position.

STEP 3
Press the "+" button on the side of the iPhone to increase the overall system volume. Press the "-" button to lower the volume. This affects the volume of the microphone as well.

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