Your iPhone cannot make and receive calls or access cellular data until it has been updated
Your iPhone cannot make and receive calls or access cellular data until it has been updated
iPhone 7 Plus
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See this Apple articles below:
Manually update your carrier settings on your iPhone or iPad
https://support.apple.com/en-us/HT201328
How to unlock your iPhone for use with a different carrier
https://support.apple.com/en-us/HT201328
Set up cellular service on iPhone
https://support.apple.com/en-gb/guide/iphone/iph3f11fba92/ios