Consequently, Capcom opted to release an original title, Resident Evil: Portable (often referred to as Resident Evil 4 Mobile Edition ), for mobile phones (specifically N-Gage and iOS). This was a scaled-down version of the game. While a version of Resident Evil 4 was released on the iOS App Store in 2009, it was optimized for Apple's hardware architecture and was never officially ported to the PSP.