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How to use cellular data to update iOS
[Re-Titled by Moderator]
If you need a second confirmation. KiltedTim is 100% correct. You must use Wifi or your home computer to update your iPhone. If you don't have a home computer with iTunes or access to Wifi yourself, go somewhere where you can access Wifi.
You don't. WiFi is required.
How to use cellular data to update iOS ?
