I occasionally get no service on my iPhone7 after updating

Jaytong1208 Said:

"mobile data issue and no service after update to iOS 15.6: occasionally no service on iPhone 7 after update to iOS 15.6"

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Troubleshooting "No Service":

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. 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.

Start here.

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