How do i turn sound on my iphone

You might have the sound muted or turned down low in the app. Check the media volume. If you still don't hear anything, verify that the media volume isn't turned down or off: Navigate to Settings.

On iPhone 7 and later, go to Settings > Sounds & Haptics. On earlier iPhone models, go to Settings > Sounds. Choose what you want to adjust, like Ringtone or New Mail. Tap the alert tone that you want.