There is a comment in the latest iOS 16.4 Beta 3 release notes that speak to this:
URL = https://developer.apple.com/documentation/ios-ipados-release-notes/ios-ipados-16_4-release-notes
Core Telephony
Deprecations
CTCarrier, a deprecated API, returns static values for apps that are built with the iOS 16.4 SDK or later. (76283818)
zubs
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