Beware of others monitoring YOUR phone with THEIR Smart Things App.....and subsequently your llocations, devices, and appliances. If you have a possessive or jealous wife or husband, and you both have Samsung smartphones, or both have Smart Things, watch out for this control freak technique!
Only possible if they have physical access to the hub. And monitoring the phone with the app is a no-go. You can see the phone on the network, but doesnt give access to texts, calls, browsing history etc. At most, they can see where you are if your location is turned on, but even Google has better methods for that.