Why isn't my iPhone headphone jack not working?

My not even a month old iPhone 6s headphone jack isn't working. I will plug in my headphones and the sound isn't being played in the headphones and is still playing as it should without anything plugged in, I have tried other earbuds and headphones but they do the same. Does anyone know what's wrong?

Then it should still have a manufacturer warranty. Return it and get it replaced with a full functioning unit.

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