Call of Duty 4: Modern Warfare on PSP - Not Released

No, Call of Duty 4: Modern Warfare was never released for the PSP.

Reasons:

• Platform Exclusivity: The game launched in 2007 on Xbox 360, PlayStation 3, and PC only.
• Technical Limitations: The PSP's hardware (333 MHz CPU, 64 MB RAM) could not handle the game's engine, graphics, and large multiplayer maps.

PSP Call of Duty Titles: The PSP received spin-offs built specifically for its hardware:

• Call of Duty: Roads to Victory (2007)
• Call of Duty: World at War – Final Fronts (2008)
• Call of Duty: Modern Warfare 2 – Force Recon (2009, different campaign)