my notes are mostly on paper, but i have a document with monster statblocks and items that can be found as treasure, thats quicker than riffling through paper.
players are free to use digital character sheets or lookup spells in a pdf if they like, i don't care about your phone/tablet/computer as long as you are playing with us and not your phone and you are not distracting anyone, but if someone has to recap every turn for you because you keep using your phone, than we'd need a talk about if you actually want to be at a table.