I like to use my iPhone to take notes in lectures and seminars. I prefer it to using paper (easy to lose, hard to search, bad for the environment) or a laptop (cumbersome to carry and loud to type with).
However, I get the impression that many people are against the use of phones in lectures for any purpose. As an undergraduate, I remember some lecturers publicly shaming people who used their phones, even when they were making notes or looking up something relevant to the lecture. One lecturer in particular even brought a jug of water to the class with her, and threatened that if she saw anyone with a phone she would put it in the jug. Admittedly phones can be used for irrelevant or distracting purposes, but this is also true of laptops and paper! I am now an academic myself, but still worry about offending colleagues.
Is it acceptable to use a phone to make notes in a lecture? If not, what makes them particularly unacceptable/rude compared with a laptop or tablet? And are there any strategies that can be used to indicate to a lecturer that you are using your phone to make notes (and not to make Tik Tok videos)?
Note, I am not asking for advice about whether taking notes on an iPhone is wise, nor about whether a "no phone policy" would be a good idea (the latter point is discussed here).