After finishing off mounting my red screen filter for my notebook in a cardboard cell which I can place over my notebook screen, I had some filter left over, so what else to do but cut out a small piece for my phone!
So now when I am out under dark skies and the phone rings, I won't need to ruin my dark adapted eyes
Picture looks crappy, it actually works really well. I just have to pull off the front plastic aftermarket phone protector and slide it infront of the screen before putting the cover back on.