Use the PS Remote Play app to stream from your PS4/PS5 to your phone.
While the full Black Ops 4 game isn't on mobile, there is an older official title called Call of Duty: Black Ops Zombies . Android and iOS. Call Of Duty Black Ops 4 Apk - Obb For Android
Websites claiming to have a "Black Ops 4 Android Download" often use deceptive videos showing real gameplay that is actually just a recording of the PC or console version. Use the PS Remote Play app to stream