You do not need your phone to be present or turned on for your PIXIE home to operate.
Your PIXIE home is setup using your mobile device, and once setup, all of those settings reside inside each of the PIXIE devices installed in your home.
This means your schedules, scenes and group will all operate, when activated directly from PIXIE devices with our without your mobile phone being present or powered.
If you wish to modify schedule, scenes or groups you will need your mobile phone