While there is no official Android port of the original Call of Duty 4: Modern Warfare
There is no official mobile version of Call of Duty 4: Modern Warfare.
The game was released in 2007 for PC, Xbox 360, PS3, and later for Wii/DS. Any APK/OBB claiming to be the full CoD4 campaign or multiplayer on Android is either:
Important Safety Warning:Many websites offering an "APK + OBB" for Call of Duty 4: Modern Warfare are often providing unofficial ports or malicious software. The actual 2007 PC game can only be run on Android via PC emulators like Winlator or GameHub, which require you to own the original PC files. For the best and safest experience, always download directly from the Google Play Store.
: Legacy versions of Modern Warfare have historically been exposed to exploits (like CVE-2018-20817) that could allow remote code execution. Device Damage
Install the APK (do not open yet)
I can then provide specific optimization settings or suggest the best emulator version for your hardware.