The rapid spread of mobile phones has driven innovation in mobile communication systems such that the system undergoes a major technological overhaul approximately every ten years. This evolution began in the 1980s with the first mobile communication system (1G) using analog mobile phones. The second generation (2G) brought email and the Internet to mobile phones, while the third generation (3G) provided high-speed, large capacity communications. The fourth generation (4G) brought even higher speeds and lar
Source: NDT