Wow, I guess that there aren't really any "fully open" phones in that case. For the truly paranoid (with or without reason), I guess that they would have to go

Wow, I guess that there aren't really any "fully open" phones in that case. For the truly paranoid (with or without reason), I guess that they would have to go the RMS route -- or find a payphone that isn't within sight of a security camera.