This is a marketing tag often added by modders or re-packers to distinguish their build from standard, buggy ports. In reality, "exclusive extra quality" usually refers to one or more of the following:

If you are looking for an authentic Call of Duty experience on mobile, and Warzone Mobile are the official pathways. They feature remastered maps from Modern Warfare (2007), such as Crash, Crossfire, and Vacant, optimized for mobile hardware with legitimate security [1, 2].

(2007) developed specifically for Android devices. While unofficial "APK + OBB" files circulate online, these are often modified PC files meant for use with or are potentially malicious clones. The Illusion of "Exclusive Extra Quality" Mobile Ports

Secure the APK and OBB data files (ensure you use reputable community sources to avoid malware). Transfer the unzipped OBB folder to Android/obb/ on your device's internal storage. Install APK: Run the APK file and grant the necessary permissions.

If you decide to try the APK/OBB anyway, use a secondary device, scan files with antivirus, and avoid entering personal info. Would you like help setting up the safer emulation method instead?