I don't think any phone or headset has enough power to actually destroy eardrums. They can be loud enough to cause pain and even hearing loss over long-term

I don't think any phone or headset has enough power to actually destroy eardrums. They can be loud enough to cause pain and even hearing loss over long-term use, but not loud enough to actually blow out somebody's ear drums in one blast. Even shooting a gun without ear protection, which is much louder than any phone or headphone speaker, is very unlikely to ever rupture your ear drums outright (although some loss of hearing is certain.) I don't think you could successfully sue somebody for "they played a loud sound that was painful but my ear drums are still intact."