It would probably work. ; Just make sure that the sunglasses lens is tight to the cell lens. ; If there's even a small gap, you might pick up reflections from behind you. ; I had that happen once when I held a 3"x6" split grad ND in front of a lens with a scalloped hood. ; The gap created by the scallops let just enough light in that I ended up with some ghosted reflections that ruined the shot.
There is also a "jelly lens" that would have a polarized version (among other styles of filters) for just a couple bucks. ; It has a reusable sticky grip that holds it to the phone surface. ; Just type "jelly lens" into google or ebay.
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