I think I know what a radio phone might do. Radio clocks even exist (though a networked NTP timekeeper is more useful). I'm not sure I'd care to fly in a radio-controlled airplane. And I'm utterly perplexed at what a radio heater might be -- unless it's a microwave space heater, or an early instance of Nest.
From 1922, "Radio All the Things!": http://i.imgur.com/TSJnicdl.jpg
(Via: http://www.darkroastedblend.com/2015/01/videophones-from-fut... and origionally: http://wi.mobilities.ca/grant-wythoff-aerophone-telephot-hyp...)
Or the original book if you'd prefer: Hugo Gernsback, Radio for All (1922): https://archive.org/details/radioforall00gerniala
I think I know what a radio phone might do. Radio clocks even exist (though a networked NTP timekeeper is more useful). I'm not sure I'd care to fly in a radio-controlled airplane. And I'm utterly perplexed at what a radio heater might be -- unless it's a microwave space heater, or an early instance of Nest.