Advantages: Dual-band(B2/B5), smart chip, high-tech custom circuit, better voice quality, fewer dropped calls, works with AT&T, Verizon, T-Mobile, Sprint, compatible with any cell phone system, including iOS, Android, Windows Phone systems. It is mainly used to improve voice quality and 3G data, it does not boost 4G/LTE Data, you can access internet through your home WiFi, but it supports 2G/3G/4G call, especially suitable for remote areas.