How do I backup my iPhone without using WiFi

persis179 Said:

"How do I backup my iPhone without using WiFi"

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Use Ethernet:

Backup Up through your computer, you might be able to connect the computer through Ethernet, just to get the connection.

Use a usb to lightening cable, connect it to a Mac or Windows computer and use iTunes (or finder with MacOS Catalina or Big Sur).

Wireless iCloud backups require a WiFi connection.