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This Clamshell Nokia 282 was launched in 1998 and was one of the first devices to use this form factor.
Image: Nokia Museum
Nokia 9290 Communicator
The 9290 Communicator had a clamshell design which flipped open to reveal a QWERTY keyboard and an LCD display that took up most of the device form factor. Launched in 2002.
The N-Gage was launched in 2003. it was designed to lure gamers away from the Game Boy Advance.