If you want an authentic Call of Duty experience on a PSP emulator, there is only one official option:
Because the official game doesn't exist, you are looking for mods. Here is how to do it safely. If you want an authentic Call of Duty
No, you cannot play the actual Modern Warfare 2 campaign (like "Cliffhanger" or "The Gulag") on your phone via PPSSPP. The hardware is too weak, and the game never existed for the system. If you want an authentic Call of Duty