Uh, anyone who streams from their phone knows the ringer and voice comes through the headphone jack or audio stream. But that's not the issue- the user needs to remember how they were using the phone AND SHUT OFF THEIR A/V SYSTEM WHEN THEY'RE DONE USING IT!!!!!!!!!!!!!!!!!!

FWIW, I think the normal ringer volume is more quiet than Find Your Phone, so using something like google call or another phone is a less disturbing way to locate a cell phone.