Why is my iPhone 5s on mono?

When I plug up headsets the left speaker doesn't work I've tried 2 and it's not on mono mode what's wrong

Mono doesn't mean it only works on one speaker, it means both speakers have the same send, so both should work but no stereo sound effect will come out, and it would sound flat. What you could have is a problem with your jack. Maybe you're not plugging it right, or maybe it has been damaged. Restore your iPhone from iTunes to discard that it's not an software issue. If it keeps happening, you got your iPhone broken.

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