Transfer contacts from one iPhone to another
I would like to transfer the contacts I have on my iPhone 4s to my wife's iPhone 4s but cannot find how to do it. I have read numerous articles on doing a transfer but they all talk about resetting the phone first which I don't want to do, and are usually for someone replacing an old iPhone with a newer one.
I also read an article on using iTunes to do the transfer and went into iTunes and the left side has almost everything but contacts listed. There is Music, Movies, TV shows, books etc etc but no contacts. I also went to backup however it asks what I want to sync the contacts with and one of them is Windows, however I don't want to sync them with my Windows contacts or any other contacts for that matter, I just want to make a copy of the ones on my iPhone and then copy them back onto my wife's iPhone. I thought this would be a pretty simple process but have now spent more time reading and trying different things than I likely would have been able to manually input them all by now, so would really appreciate if someone could tell me if I am missing the obvious and there is a simple way to accomplish this?
Thank you
iPhone 4S, iOS 8.3