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How do I update iOS on cellular data?
There’s no known way to date to update iOS over cellular data, as per Apple’s requirements. The only way to update iOS over-the-air is to connect to a WiFi network or to connect via USB and iTunes for non-OTA.
How do I download iOS update over cellular network?
To download iOS updates over 5G, users will have to enable the “Allow More Data on 5G” mode in the Settings app under Cellular > Cellular Data Options > Data Mode.