GoKawiiliPhone's Background App Refresh setting explained: what it controls and doesn't
Apple's Background App Refresh feature, found in Settings > General, lets iPhone users control which apps can update content while running in the background. Users can toggle it for Wi-Fi only, Wi-Fi and cellular, or turn it off entirely, and can also customize it on a per-app basis. Importantly, disabling this setting does not stop an app from sending notifications.