No sounds on my iPhone
No sounds on my iPhone se 2nd generation
iPhone SE, iOS 15
It looks like you've already viewed an article related to your problem (If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker - Apple Support).
I'm assuming this article didn't help you?
Try restarting your iPhone, and if that doesn't fix it, I suggest speaking to Apple Support.
-- Jay (they/he)