Galaxy S5 Wi-Fi not connecting to any network, other Wi-Fi problems

The #GalaxyS5 Wi-Fi connectivity function seldom gives trouble to most users. Unlike mobile connectivity, Wi-Fi problems are relatively easy to fix as most of the time the cause or causes (router mis-configuration, wrong phone setup, interference) are within a user’s reach. Below are some of the examples of these cases. This post addresses these topics: Samsung Galaxy