This document provides an introduction to 5G networks, including: an overview of the evolution from 1G to 5G; details on taking the first call on 5G and the hardware/software aspects; descriptions of the 5G architecture and its features; comparisons of 3G vs. 5G technologies; and discussions of applications, advantages, and disadvantages of 5G. It concludes with information on Huawei investing in 5G research and potential questions.