I don’t have Wi-Fi and don’t know how to iCloud back up
I don’t have Wi-Fi so I need to try to figure out how to back up my iCloud
iPhone 11 Pro Max, iOS 15
See the following from Back up iPhone - Apple Support
Note: On models that support 5G, your carrier may give you the option to back up iPhone using your cellular network. Go to Settings > [your name] > iCloud > iCloud Backup, then turn on or off Backup Over Cellular.