I once heard a Choshuv Rav explain how the conversation probably went:
Askanim: Is someone with an iPhone Passul L’eidus?
R’ Chaim Kanievsky: Mah Zeh iPhone?
Askanim: It’s a thing where you watch all types of Znus and Gilui Arayos.
R’ Chaim: Passul L’eidus!