In one embodiment, a technique for Internet of Things gateway-based carrier-operator signage monitoring is provided that illustratively comprises: receiving, by a gateway device and from a first device of a plurality of devices of a mesh network in a monitored site, positioning information associated with a second device of the plurality of devices, wherein each of the plurality of devices is affixed to a respective sign; generating, by the gateway device, site monitoring information by aggregating the positioning information with other positioning information received from the plurality of devices, wherein the site monitoring information indicates a physical change in placement of a sign to which the second device is affixed; and sending, by the gateway device, the site monitoring information to a signage monitoring device configured to perform a mitigation action for the monitored site based on an identification of the physical change in placement of the sign.