By greatest invention I mean something that had big and positive influence.
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I think anything you could call a smartphone had to be from post-2000 though, right?
That’s going to be a tough one to call. Nokia Communicator had diary (calendar), web browsing and email features in the 90s. You could also tether off it, but it was dialup and most phones could do that.
That was pretty much the definition of a smart phone at the time.
