List and describe the four different generations of cellular technology.?

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The four generations of cell phone technology are as follows:First-generation, or 1G, services from the 1970s and 1980s were analog.Second-generation, or 2G, services, which reigned in the 1990s, used digital transmission and paved the way for texting and media downloads on mobile devices. Still, data transmission on 2G systems didn't exceed 240 Kbps.Third-generation, or 3G, services were released in the early 2000s. Data rates rose to 384 Kbps and data (but not voice) communications used packet switching.Fourth-generation, or 4G, services are characterized by an all-IP, packet-switched network for both data and voice transmission. 4G standards, released in 2008, also specify throughputs of 100 Mbps for fast-moving mobile clients, such as those in cars, and 1 Gbps for slow-moving mobile clients, such as pedestrians. WiMAX, though not strictly a cellular-based technology, is considered 4G because of its high-speed, packet-switched characteristics. Later in this section, you will learn about other 3G and 4G systems.