The Monnit 4G Cellular SIM Card (MNA-SIM-CRD-ATT) is a SIM card provisioned for AT&T's network, intended for use in Monnit cellular gateways and sensor systems that rely on 4G connectivity to transmit monitoring data. Rather than being a monitoring device itself, this SIM is the connectivity component that lets a compatible Monnit gateway reach the AT&T cellular network and forward sensor readings to a monitoring platform. Deploying a dedicated SIM card alongside cellular monitoring hardware lets remote sensors, gateways and industrial monitoring equipment operate in locations without Wi-Fi or wired internet, using the AT&T 4G network for data backhaul instead. Because it is provisioned specifically for AT&T, it is intended for deployments where AT&T coverage matches the installation site. For businesses managing distributed sensor networks, cold-chain monitoring, or remote asset tracking, keeping a spare or replacement 4G SIM on hand helps keep a Monnit gateway online if a card needs to be swapped, a device is redeployed, or a new gateway is added to an existing monitoring account. Its compact SIM form factor makes it easy to stock alongside other Monnit hardware in a spares kit.