How update without wifi
how update I phone 6s plus without wifi
Connect it to a Mac or PC computer and do the update
that way.
2 replies
This link offers instructions on how to do what imobl suggests. I’ve copied the pertinent part below.
Update your iPhone or iPad - Apple Support
Use your computer to update your device manually. Learn how to update your device manually if you're using a Mac with macOS Catalina or later, or if you're using a Mac with macOS Mojave or earlier or a Windows PC.
How update without wifi