Method for operating a server with user equipment in a cellular network

A Central server for communicating with a user equipment via a common Internet Protocol (IP) address through at least one cellular network, being communicatively coupled with said at least one cellular network by means of a Packet Data Network Gateway (PDN-GW) via Internet,

• said central server being configured to provide an interface for a service provider on said at least one cellular network and exchange information relating to at least one preconfigured qualifier assigned to at least one user equipment being assigned to the central server, and
• to receive a payload item from said cellular network transmitted by said user equipment to said cellular network responsive to a measurement result by means of an authentication failure message to communicate smart-metered data to said service provider,
• for authenticating said user equipment on said cellular network during an attach process started by the user equipment comprising the payload item for cost optimizations;
• wherein said payload item is the result of a measurement of a sensor connectively coupled to the user equipment when operating as an Internet of Things (IoT) smart-metering device.