Answer:
have u tried putting ur 8+ in the glass while on speaker phone?
Step-by-step explanation:
putting the phone in the glass cup should make it louder. if u didn't put it on speaker phone, then it won't work
I had the same issue, but different phone and I did tried it and it worked. maybe it would work on your 8+ too, if your phone speaker is @ the bottom. if not, do the opposite of bottom