Some questions to kick things off....
What happens when he tries to access the Internet via 4G/LTE? Is he able to access the Internet via WiFi? Can he still make and receive calls & texts? Can he still access Apple's app store?
Everywhere your son goes?
Did he switch into Airplane Mode? Try Toggling Airplane mode.
Try resetting Network Settings.
Having a data connection is defintiely a must, please clarify if you can connect to WiFi at all, and which plan are you on?
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