Modern Combat 3 was designed for much older versions of Android (2.1 to 8.0/9.0). If you are using a modern device (Android 14 or 15), you may face issues:
Since the game is considered "abandonware" by many in the community, you can find it on archival and third-party hosting sites: Where to Find It Modern Combat 3 was designed for much older
The Internet Archive hosts version 1.4.01 , which is often safer than random torrent sites. Modern Combat 3 was designed for much older