Alarm over 4G/GSM?

Hi I am thinking buying Homey and connect Netatmo indoor/outdoor cameras and door and window sensors or security system Smonos. But does any one know of a GSM/4G that can send a detection to App if power and Internet is down? Is there a gadget for that kind of problem to solve, perhaps a powersupply and GSM/4G gadget together? Most Alarm operators has that installed in their systems.

The only things I know are

  • A UPS with GSM/SMS functionality
  • A router with GSM/SMS backup functionality
  • An (old) smartphone with permanent power, and ofcourse an active gsm+data sim.
    With Macroidroid, create a macro with a “Power disconnected” trigger, and a “send message / sms / email” action.

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