Can’t get cell service with new update

Here are suggestions of what to try from Apple Support

If you see SOS, No Service, or Searching on your iPhone or iPad - Apple Support

Try to reconnect to your cellular network

If your cellular network is available, you might be able to reconnect to it by following these steps: 

1. Open the Settings app.
2. Turn on Airplane Mode for at least 15 seconds.
3. Turn off Airplane Mode.

Restart your iPhone or iPad

Restart your device. If you're not sure how to do this, follow these steps to restart your iPhone or restart your iPad.

Contact your carrier 

Issues with your carrier or account might affect your service. Contact your carrier to:

• Verify that your account is active and in good standing.
• Make sure that you're in an area with cellular network coverage and there are no outages in your area.
• Check that your device isn't blocked or barred from receiving cellular services and is set up with the right data plan.
• Ask if your local government requires IMEI registration to use an iPhone that you originally purchased outside your country or region.

Only your wireless carrier can access and manage details about your account:

• iPhone wireless carriers
• iPad wireless carriers