Another case of closed-minded open-mindedness. Is there really no difference between a computer and a smart phone? I really dont wanna go thru a whole internet shmooze here but ya
1. smartphones are 24/7
2. they’re a little more private
Back to the OPs question, who obviously was coming from a position that it ISN’T so simple. It is more common among girls to have a smartphone, ie a female version of a guy that doesnt have a smartphone might have one. Depending on how yeshivish/frum you are a girl shud or shud not have one. Probably find out from your friends that you consider on your “level”.