Go to Settings > Sounds (or Settings > Sounds & Haptics), and drag the Ringer and Alerts slider back and forth a few times. If you don't hear any sound, or if your speaker button on the Ringer and Alerts slider is dimmed, your speaker might need service. Contact Apple Support for iPhone, iPad, or iPod touch.

Why does my phone suddenly have no sound?

Clean the speaker. Speakers get dirty or clogged, so a bit of cleaning could make sounds clear again. Before you clean the speaker, turn off the phone and remove the battery. ... When you reset your phone's settings to the default, any app or software setting that may have disabled the speaker is eliminated.

How do I fix my iPhone no sound?