For me, the word "gadget" implies both a certain level of portability and, dare I say it, frivolousness. I'd argue that a cellphone per se isn't even a gadget anymore, although the latest iPhone is. A wristwatch isn't a gadget, but a smart watch is. So I do think that stuff can evolve from gadget to necessity; however, I still think a gadget has to be smaller than a breadbox.
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