candy i also feel the same way,
one time i asked to use someone’s blackberry to pray mincha and it was horrible! its so much more meaningful(for me) with a siddur, that i can actually hold close to me and turn pages and see explanations for the words…
also i made a mistake once, by thinking that someone was texting while praying but they were really just praying from their phone! but do u think it could be considered maris ayin?