if any boy was to turn down a girl he liked just because she has a smartphone he is a very dumb boy.
the girl would also want a serious explanation as to why she was turned down and would be very shocked to see a boy act so narrow minded.
as long as the phone is used for the right reasons then i dont see what people make such a matsav about.
then again it does depend on what level of yiddishkeit a person is on and who are we to judge?!