I Have the iPhone 6 128GB
My phone started having this problem today where I could not hear anyone
that was calling me or that I was calling it was super quiet and muffled. I could
hear them just fine on speaker phone or with a head set so I quickly realized the
problem was with the actual earpiece on the phone. I had never had this problem
before so I was worried my phone had met its end...
After reading this site and what everyone was saying I decided to inspect my
phone closer and used my fingernail to gently rub it across the ear piece, (if you're
like me your phone goes everywhere, in your pocket, on the ground, tables, chairs
purses... You name it, your phone has probably been there.) as I gently scratched
at the ear piece I noticed dirt or grime was coming out of the speaker onto the phone
I decided to grab a dry q-tip and rub the ear piece vigorously to which end the q-tip
was covered in "NASTY" I then took a little rubbing alcohol and held my phone face
down (screen toward the ground) as to not get it in my phone and lightly got some on
the q-tip I then lightly rubbed the q-tip across the earpiece and to my surprise, my
phone works perfectly now, with out having to have it on hearing aid mode.
P.S. My boyfriends phone had also been doing this for months and he just dealt with it
and used speaker phone. I decided to do the same thing to his phone and it now
works perfectly as well!
Hope this helps!! Crossing my fingers for you!