A lot of us use our phones for mapping nowadays. On one of my scouting trips earlier this year I was making my way along the trail in the predawn with my red light headlamp. All was well. I pulled up the map to double check, and even with it on a dim setting, the sudden light spooked what I think was a moose. I'd like to not hunker over my phone every time I'm making my way to a spot in the dark. Iphone now has a way to turn its screen red. But not my Galaxy S9+. I'm curious if any of you have experimented with a red film that adheres well to a cell phone screen? Does it work? Heck, does the Iphone's red screen work?