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Integrating UEs into the fog can raise many advanced people-centric applications that are directly related to people's daily lives. For example, in the lost child situation, local government or police can collaborate with a local ISP to request the SDN mechanism-supported UE-fog nodes, which are hosted on the smartphones of the people on-site, to assist the lost child situation by utilizing the inbuilt cameras and audio recorder of the UEs as the sensors, then utilize some of the more powerful UE-fog nodes as the super-peers to route the data to the local cloud of the ISP, which is accessible by the government and the police, toward hastening the entire process. Moreover, the UE-fog nodes that have high-performance computational power can also provide context as a service (CaaS) instead of routing the raw sensory data [36]. Specifically, CaaS mechanism–supported UE-fog nodes allow the requesters to deploy their own data processing algorithm to UE-fog nodes toward preprocessing the raw sensory data and hastening the overall process.