Alien Front (cancelled Nokia N-gage port of action game; 2004)
Alien Front was a planned port of action video game Alien Front Online (originally released for the Sega Dreamcast) for Nokia's N-Gage mobile phone/console hybrid. This port was going to be developed and published by Sega, which had previously developed and published games for the N-Gage.
On February 9, 2004, Nokia and Sega had announced that they would port two branded titles to the N-Gage. Alien Front, which was originally released on the Sega Dreamcast and Virtua Cop (originally on the Sega Saturn) were announced with Spring 2004 release dates. Those ports would be downsized for easier porting to mobile phones.
Gameplay footage obtained by IGN showed that you would be able to fight off aliens as humans in a certain time frame. As humans, you needed to destroy as many alien ships as possible while defending an objective. It is not known whether this port would allow you to play as aliens like the Dreamcast version did. It was also stated that you would be able to play online through the Nokia N-Gage Arena. 
As the release date for Alien Front came and went, it was never released. There has not been an official statement from Sega as to why this port was cancelled. Many point out the fact that the Nokia N-Gage did not sell well. This may have caused the cancellation of the port. The port was speculated to have been complete as details like an MRSP, an ESRB rating, and gameplay were all released. 
- Sega and Nokia announcing the two ports of the games Retrieved 25 Jan '18
- Gameplay of Alien Front port Retrieved 25 Jan '18
- IGN information page about the game with the MSRP and ESRB rating Retrieved 25 Jan '18