The document discusses three types of wireless communications: 1) wireless messaging services that allow users to send text, images, and video between mobile devices; 2) wireless internet access points like hotspots that enable mobile users to access the internet; and 3) global positioning systems (GPS) that use satellites to determine the location of receivers in mobile devices. The document provides examples of how mobile users take advantage of these wireless communication technologies through their mobile phones, computers, and other devices.