How to change my Backup from wifi to cellular network
How to change my iCloud backup from wifi to cellular with my iPhone 6s
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For information on using cellular for iCloud backup, see the following from: Back up iPhone - Apple Support
Note that it is only possible with phones that support 5G cellular and only with some carriers.
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.