Until recently, my contacts appeared on my wife's phone, and vice versa. Now they don't. I can't recall how I set that up, or perhaps it has been made impossible now. Any help would be appreciated.
You can try this. If you are sharing them into a common location such as Google, or Samsung, go to Contacts > 3 dashes left side > top button should say something like Google, or Samsung or something else. Click that button. Tell your contact list to go to ALL CONTACTS. Then do the same to your wifes phone. This should link all of the contacts to both phones, IF you are using a common location/account.