With managed IoT connectivity, the provider takes proactive responsibility for keeping customers’ devices online — including 24/7 monitoring, carrier management, and hands-on support when something goes wrong. With unmanaged (more specifically, self- or semi-managed) connectivity, a customer can get a SIM card or data plan, but handles all monitoring, troubleshooting, and carrier coordination themselves. The difference is most visible when problems occur: managed means someone else is already working on it before you notice.