Making your home smarter is probably on more people's minds than ever right now, but it can become a seriously dizzying project just remembering all the various voice commands and apps involved, to the point that you might even want a dedicated piece of hardware for controlling it all. Kind of like a universal TV remote, but for light bulbs, cameras, and smart thermostats. And using an old smartphone, you basically can, just as long as it isn't too old.

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