A multiple entity gateway for supporting cellular authentication from a non-cellular network, the gateway comprising a plurality of entities each located at a different one of a plurality of secure zones and having at least one gap between said entities across said secure zones, said gateway being configured to predefine communication signals allowed across said gap between said entities, thereby to filter out non-allowed signals, and provide secure cellular authentication for a communication originating from said non-cellular network. The gateway allows cellular users to connect to a cellular network via a wireless local area network such as a hotspot, use the services of the cellular network, the Internet and the hotspot at will, and be securely authenticated and charged through the cellular infrastructure.