WWAN

I manage a small fleet of Windows field laptops with built-in cellular modems. They leave the office on the corporate APN and come back months later — usually after a driver update, a Windows feature update, or someone reseating the SIM — quietly sitting on the carrier’s consumer APN instead. The machine happily reports Connected. It even passes traffic. It just cannot reach anything on the corporate network: no VPN, no telemetry, no remote management. You find out from an angry phone call, never from the machine itself. ...