2G Technology

2G stands for the second generation in wireless telephone communication, which was commercially launched in 1991. Although mobile phones have been in use since the 1980s, the technology behind 2G made cell phones smaller, more reliable, and more affordable.

To understand the significance of 2G networks, it helps to know something about the first generation of mobile telecommunication systems, now known as 1G. The first mobile phones used analog (voice only) signals and consumed a great deal of battery power. Since they housed large batteries, 1G cell phones were much bigger than cell phones of today and were not truly portable, although they were often permanently installed in cars. Communication over 1G mobile phone was not secure, since anyone could eavesdrop with a radio scanner.

With the introduction of fully digital signals, the cellular landscape changed dramatically. Second generation cell phones were more energy-efficient and could run on smaller batteries, which meant the phones themselves could be made smaller than before. For the first time, cell phones were truly portable. Because signals over 2G networks were encrypted digitally, cell phone signals became much more difficult (though not impossible) for hackers to intercept. But one of the greatest benefits of 2G technology was that small amounts of data could be transmitted along with voice information. This made text messaging and caller ID possible.

There are more than a few downsides to 2G networks. In spite of its shortcomings, 1G’s analog signals degrade more gracefully than 2G’s digital signals. While a failing 1G signal might pick up static or slowly fade, 2G digital signals become choppy or fail altogether, resulting in dropped calls. Also, the data transfer capabilities of 2G networks are very slow, unable to exceed more than 20kbps.

Eventually many 2G networks were upgraded to 2.5G, which can transfer data at the speed of dial-up (30 to 90 kbps). Although this made downloading ring tones and surfing the Internet possible, there was still plenty of room for improvement. The quest for faster data transfer speeds would soon lead to the development of 3G networks, the third generation in cellular telecommunications technology.