HP Jornada
Launched in 1998 and discontinued in 2002, HP Jornada was HP's personal digital assistant. It had several product issues leading to multiple recalls, while it wasn't as popular as other hand held devices.
HP Veer
In May 2011, the Veer smartphone was released and then it was discontinued in August 2011. The Veer is a minimal 3.3 inches long and just 2.1 inches wide with a screen that measures just 2.6 inches diagonally. That size makes it ultraportable, but ...