In what way could an app make an automated change to the user’s phone only when in close proximity to another specific phone? [on hold]

        I will be having an app built but would like to see if this is even possible before hiring it out.
The purpose of the app is to change the wallpaper only when they are near their spouses phone. So they can have their favorite gaming wallpaper when not around, but as soon as the phone detects the spouses phone, it changes to a picture of them ( or whatever). Aww, how sweet. I am trying to find a technology that the users phone could use to see the available phones around. The closest I can fond is Mac address, but the newer software versions change the mac address to protect privacy. Any ideas? Thanks!

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