If your phone is turned off, e.g. because the battery is flat, your tado° will no longer be able to receive any further changes to your location. In this case, tado° will not be able to detect if your smartphone is Home or Away. Hence, tado° will not control your heating or AC system based on the residents’ location anymore. The Smart Schedule will remain in the mode that was active when the mobile device turned off.
If the location information for all users is older than 48 hours, tado° will notify you to switch to Away Mode to prevent unnecessary energy usage.