An update is required to use cellular data on this iPhone

Update your carrier settings on your iPhone or iPad

1. Make sure your device is connected to a Wi-Fi or cellular network.
2. Tap Settings > General > About. If an update is available, you'll see an option to update your carriersettings.

Update your carrier settings on your iPhone or iPad - Apple Support

https://support.apple.com/en-in/HT201270

Hi, I have the same problem, except there is no new update for the carrier settings. What should I do?

hi,

did u received any solution. i am also facing the same problem.