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Which speaker is not working? You have a speaker at the top of the screen to hear people when you are on a phone call. You have a speaker on the right of the charging port on the bottom of the phone and to the left you have the microphone, so people can hear you when you are on a phone call.

Here is a link on what to do if the speakers don't work on iPhone --> If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker - Apple Support

See if the following support article can help:

• If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker - Apple Support