A guide to fix heaing related issues on your iphone
Check your sound settings
If your device has a Ring/Silent switch, move the switch forward—toward the device’s display—so that orange isn’t showing. If you’re using an iPad, you can also swipe down from the top-right corner to view Control Center and make sure that Silent Mode is off.
Open Settings > Focus > Do Not Disturb and make sure that Do Not Disturb is off.