Unable to activate
Why is my iPhone saying “An update is required to activate your iPhone”?
iPhone 8 Plus, iOS 14
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See -> If you can't activate your iPhone or iPad (Wi-Fi + Cellular)
If you can't activate your iPhone or iPad (Wi-Fi + Cellular) - Apple Support
See these Apple articles below:
Manually update your carrier settings on your iPhone or iPad
Manually update your carrier settings on your iPhone or iPad - Apple Support
Update your network provider settings manually on your iPhone or iPad
Update your network provider settings manually on your iPhone or iPad – Apple Support (UK)