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Because of smartphones, pocket TVs were never a thing.
(lemmy.world)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
Not a pocket tv, but we had radios that picked up tv signals. Those were pretty popular. We had several when i was a kid. You could still buy them fairly recently - before the digital thing. We used to take one camping for local weather reports.