Clear the Warzone Mobile Game Cache\n\n To potentially resolve various issues, including the Unable to connect to a data center  error, consider clearing the cache of the Warzone Mobile app. If you're using an Android device, access your device settings, locate the Warzone Mobile app, and clear its cache.

Call of Duty: Warzone uses the most data, with about 0.16 GB per hour. Call of Duty: Black Ops 4 uses half the amount of data, coming in at about 0.08 GB per hour.