Ah yes, of course! I almost forgot to mention that when the house is set to Away mode all lights turn off automatically. No need to remember to turn everything off before leaving!
To reliably use our phones as a presence sensor I use the Combined Presence app, which uses the phone being disconnected from WiFi AND it outside of the geofence to trigger Away. And it uses the phone being in the GeoFence OR it being connected to WiFi to stop Away mode.
I use it in conjunction with the iPhone WiFi Presence Sensor app (works with Android too).