Nokia N-Gage 

2003-2005 

The N-Gage was not a failure of ideas – it was a failure of implementation. Back in the year 2000, many people carried both mobile phones and handheld game consoles. Nokia combined these two devices into one unit. Smart. However, the device had to be disassembled to change games. Not so smart.
To use it as a phone, the user had to hold the device sideways, with its thin edge against their head. This led to its mocking nickname as “the taco phone.”  Along with design flaws, there was also a severe lack of good games to play.

Additional info:
Wikipedia
Newegg.com/ – The (Not Quite) Greatness of Nokia’s N-Gage
Silicon.co.uk – Tales In Tech History: Nokia N-Gage