If you want multiplayer, consider Modern Combat 5 (still semi-active) or switching to Call of Duty: Mobile or Standoff 2 .
Without the OBB file, the APK will launch, but you will likely see a black screen or an error message stating "Download failed" because the game cannot locate the textures and sounds required to run. Modern Combat 4 Apk Obb
If the game asks to download data again, the OBB is in the wrong location or corrupted. If you want multiplayer, consider Modern Combat 5
Even with the correct , you may encounter issues. Here is how to fix them. If you want multiplayer