iPhone XR won't connect to cellular data

Hi Along2511,

Thanks for reaching out to Apple Support Communities. It sounds like you're having an issue with the cellular service on your iPhone. We're happy to help.

Are you seeing an alert that the "Cellular Update Failed"? If so, we recommend the steps here: If you see an Update Failed or Apple Pay Not Available alert after iOS update or restart

Also, we recommend ensuring your SIM card is inserted correctly and your cellular service is set up using the help of the guide here: Set up cellular service on iPhone

If you've contacted your carrier and completed the remaining steps in the article you posted this from, Contact Apple Support

Should you need help contacting your carrier check the contact info here: Wireless carrier support and features for iPhone

Best!