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[Re-Titled by Moderator]
iPhone 7, iOS 15
I put my working SIM in, and I can browse the web on cellular but am also having this exact problem and error message. My iPhone 7 is on 15.0.2, and won't install 15.1, which is the only update it sees.
Try updating using your computer -
Click on this link for instructions on how to update your phone using a computer
Update iOS on iPhone - Apple Support
You need a cellular network connection to activate the iPhone after an update.
I fixed this by connecting to my Mac and upgrading iOS in the Finder.
I can't update my iPhone to iOS 15.8
