MY SPEAKER IS NOT WORking

See:

If the microphones on your iPhone aren't working - Apple Support

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If people can't hear you when you're using speakerphone

1. Open the Camera app.
2. Record a video while speaking at the top of your iPhone.
3. Tap the camera chooser  to switch to the other camera. Then record another video while speaking at the top of your iPhone.
4. When you play back the videos, you should hear your voice clearly.

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If you can't her yourself there either there is something wrong with that micrtophone:

Contact Apple for support and service - Apple Support