As 3G evolved, additional frequency bands were included as well as spectrum around 2100 MHz . 4G LTE technologies brought it additional spectrum and frequency bands, namely around 600 MHz, 700 MHz, 1.7/2.1 GHz, 2.3 GHz, and 2.5 GHz. All of the previous cellular network frequencies are based on licenses (Table 1).15 Şub 2019