I put the earpiece against my ear and angle the other part of the phone away from my head about an inch. This keeps all facial oils off of the screen
I thought I was the only one who did this

so how many users talk on the phone instead of the headphones? I hate oil from my face getting on the screen so I use my headphones 90% of the time. It's funny I'm reminded of something I read, back in the 30s or some earlier time people used to drink water with radiation properties in it as a tonic because they thought it was good for you. Then once someone's jaw rotted off they investigated and stopped doing it. So it would be funny if 50 years from now, what are considered acceptable levels of radiation from cell phones and other objects now is totally overhauled and considered too high. The levels are based on what we know now, but in time perceptions may change with new info.
Look up shoe fitting x-ray machine

it's funny how backward things look when you are in a different time.