Samsung recently introduced a separate kit for it’s Galaxy S4 and S5 models which includes Wireless adapter and charging station. You can buy the Samsung Galaxy S4 Wireless S Charger Kit from here.

This is the easiest way to add this feature because all you need to do is to remove the back cover of your phone and replace it with the provided cover in the kit. The cover provided in the kit has already built-in Wireless adapter and all you need to do is to place the phone on charging station.

Anker Ultra-Slim Qi-Enabled Wireless Charging Pad

With Anker Ultra-Slim Qi-Enabled Wireless Charging Pad and adapter you can add wireless charging feature in almost any latest high end mobile of companies like Samsung, LG, Google Nexus etc.