An update is required to use Cellular data on this iPhone
Cellular Issue
iPhone 7, iOS 15
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Cellular Issue
iPhone 7, iOS 15
Reading your products list, if your iPhone 7 is updated to the latest supported iOS version for that model (now 15.8.3), it might depend on your cellular carrier possibly missing update.
Contact them and explain your problem.
Regards
Giulio
An update is required to use Cellular data on this iPhone