A:AnswerYes, I don't see why not. The UV light should clean the surfaces it shines upon. I don't think UV light on a cracked phone screen will have any negative effects.
A:AnswerI own the Samsung Note 20 Ultra which, I believe, is larger than the iPhone Max and it fits. You should remove any protective case before using the sanitizer.
A:AnswerI have the Note 20 Ultra which is larger than the Note 8 and it fits with room to spare. You should remove the protective case before you sanitize your phone. Otherwise your battery will get too hot.