My phone has no cellular service. It said, an update is required to use cellular data on this phone. Can’t update

Star0055 Said:

"My phone has no cellular service. It said, an update is required to use cellular data on this phone. Can’t update: My phone will not connect to cellular service. Can’t update"

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Troubleshooting iPhone Updates:

A. Installing a Cellular Update?:

It might be prompting you for a cellular update to install. So, go here for that. Update your carrier settings manually on your iPhone or iPad - Apple Support

Also...

B. "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

Also...

C. Update your iPhone:

Update Using a Computer:

• Use my User Tip:  Update your iPhone Using a Computer - User Tip
• IMPORTANT: If you have an option to update, however, then be certain you backup your iPhone first. That way, you will have something to restore your iPhone from should anything go wrong with the update

Contact your carrier for help. They can provide you with the update that you need.