The internet is a series of connected computer networks. All you need to do to turn it off is to go the places they connect and pull the plug. So if you are the government you go to the isps that provide service and tell them to turn it off. / disconnect. Threat of arrest / death normally works pretty well here. As for mobile that eventually gets back to a hard line connection and the same thing applies tell the people to turn it off. Near the borders it might be harder to do with mobile but the radio waves only have a limited distance they can travel.
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