An update is required to use cellular data on my iPhone

"An update is required to use cellular data on my iPhone: My iPhone has detected a cellular issue"

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Thank you for the screenshot.

Install a Cellular Update:

It's prompting you to install a cellular update. So, go here for that: Update your Carrier Settings Manually on your iPhone or iPad - Apple Support

Please clean sim by taking sim tray out clean the tray and sim both using cotton and insert again don’t forget to restart if the issue persists visit apple service centre as you got your warranty online