I can't use cellular data on my iPhone 13

dc5270 Said:

"I can't use cellular data on my iPhone 13: iPhone 13 have not been able to use mobile data"

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Is cellular dulled-out in Settings?

Troubleshooting Cellular Data:

A. "No Service":

Is "No Service" shown on the top-left corner of your screen? If so, go here to fix that: If you See No Service or Searching on your iPhone or iPad - Apple Support

B. No SIM":

Is "No SIM" shown on the top-left corner of your screen? If so, go here to fix that: If you See 'invalid SIM' or 'no SIM' on your iPhone or iPad - Apple Support

C. Contact your Carrier:

Having issues with Cellular, contact your Carrier, asking them to configure this to the correct settings. They configure all of this in the SIM card.

Maybe your cell plan does not include mobile data. Check with your mobile/cell plan provider.