First of all, if you’re hearing about 5G Wi-Fi or AT&T’s “5G E” phones, they aren’t 5G cellular . … 2G technologies, such as CDMA, GSM, and TDMA, were the first generation of digital cellular technologies. 3G technologies, such as EVDO, HSPA, and UMTS, brought speeds from 200kbps to a few megabits per second.