Lost cellular connection after iOS update

Ok, so if your carrier says it’s fine on their end and with a new SIM it’s time to talk to Apple again Power that link. “If your carrier confirms that there's no issue with your account or network, but you still can't connect to a cellular network, contact Apple Support.”

Follow https://support.apple.com/en-us/HT201415

Alchem-m6-c2 Said:

"Lost cellular connection after iOS update: Any solutions?"

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Contact your Carrier --seems something was misconfigured after the update was installed.