Wireless Range Extender, also known as WI - EX, amplifies signal waves for better reception in those areas where cell phone signals are week or in other words, Wireless range extenders and amplifiers are designed on the principle of enhancing the captured radiations to maximum so that they can reach the phone easily. These wireless phone extenders can be used either inside or outside any building or even in cars to enhance signals. These are used with GSM and CDMA frequency supported phones and covers AT&T, Verizon, Sprint, T-Mobile, Metro, PCS, Alltel and other service provider in North America and many others around the world.