This chapter assumes a commonly adopted framework of use for mobile connectivity in the 5G era. It reviews the standardization path, and the expected objectives and characteristics in the 5G phase, learning from best practice and bottlenecks alike, in the development of mobile standards in previous and current generations: 2G, 3G, and 4G (LTE). The 5G golden triangle of use cases has three summits: the top edge standing for the broadband use by humans, as expected in a human-centric society, and the bottom two edges are about machine-type communication use case categories. These machine-type communication categories are massive connectivity for machines and machines operating in real-time mission critical environment. 5G has a more stringent dual purpose: Humans will benefit from higher Internet speed; and Machines, need to leverage on the Internet of Things (IoT) with ubiquitous, massive, and ultrareliable connectivity.