No service and error the cellular
How to fix this error and no service
iPhone 6 Plus, iOS 12
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If you see No Service, check if you are in an area where there is coverage. Also try restarting your iPhone, remember you may have to enter the PIN code for your SIM card when your iPhone turns on again. Without the PIN, your SIM card cannot connect to networks. You can also contact your Carrier.
You can find more useful information here:
If you see No Service, Searching, or SOS on your iPhone or iPad - Apple Support