its only a question if its not filtered,
based on the assumption that a girl/boy with a smartphone whould want to continue owning one once married or have other internet access at his/her immediate disposal, then its absurd to think that it should not be a factor. the gedolim have said that its a issur chomur to own one or to have (unfiltered) internet access in your house, and its clear to all that a home with internet access and a home without are completely different, so whats the question?
if my assumption is not correct and after the chasuna he/she does not plan on having a iphone/acess to the internet at home, then the question is what does it show about the person. the fact that they purchased a iphone does not tell you so much. then one thing is clear during the time that they have internet it makes a difference in the person.
one last point in regards to what it tells you about a person having a personnel smartphone is definitely different to having access to the internet in their homes (usually their parents home).