binary_sensor:
  - platform: template
    sensors:
      anybody_home:
        device_class: presence
        friendly_name: Nogen hjemme
        value_template: >-
          {{ is_state('device_tracker.iphone1', 'home')
          or is_state('device_tracker.iphone2', 'home')
          or is_state('device_tracker.iphone3', 'home') }}