update is required to use cellular data on this ip

Perhaps this will help:

Manually update your carrier settings on your iPhone or iPad - Apple Support

If not, then this is an issue you probably will need to take up with your cellular provider.

A friendly tip: have a bit of patience when you ask a question. This isn't live chat and Apple Support does not participate in these forums. We're all just fellow users here, helping as we have time and knowledge to share, so it may take more than the very short time you waited before anyone even sees your question, much less has time to formulate a diagnosis and post a suggestion.

Regards.