Smart thermostat
Smart thermostats are thermostats that can be used with home automation and are responsible for controlling a home's heating and/or air conditioning. They perform similar functions as a Programmable thermostat as they allow the user to control the temperature of their home throughout the day using a schedule, but also contain additional features, such as sensors and WiFi connectivity, that improve upon the issues with programmable thermostats,
IEEE 802.21
Crossing different administrative connectivity domains will require agreements among different network operators. Currently, such agreements are still not in place. In smart phones today, a user can manually select to use WiFi or cellular LTE, but the connections are not automatically maintained should a 
disconnection of one network occurs.