On iOS, it's pretty much just fire-and-forget. You do get notified when a device isn't reachable anymore, which usually means the app has been uninstalled (so t

On iOS, it's pretty much just fire-and-forget. You do get notified when a device isn't reachable anymore, which usually means the app has been uninstalled (so that's sort of feedback). (I think this also might trigger if the phone is offline for a long time, but I'm not sure.)