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They still make great mobile phones

yeah, but they lost a significant market share. Same with Blackberry.
This goes to show that being the first movers guarantees nothing. You need to keep up with trends and make some risky bets.

They resisted the smartphone move. That is what did them in.

they had a working model, so I don't blame them. Same thing with Apple. They are choosing not to innovative, giving the likes of Samsung, xiaomi, and one plus the chance to take more market share through the innovative product line.