I have Geofencing set up to turn on a specific light or two as I get home IF after sun goes down... This is set using local time and Sunset info through some service in HUE... I did nothing special to make it work. I only use it on my phone. My wife never gets home before I do as I work 6 miles from home, she works almost 20 miles from home... Dallas Traffic keeps her on the road long enough I get home before her.
From what I read when set up, you can allow any phone you want, to access your account and be set up to do the same as the original one. The first one home will control the lighting, the second only turns them on if the first phone came home before the trigger time.