Russia has the second most at 145 million, followed by India (83 million) and the United States (78 million). Although Europe was the early adopter of GSM technology, China currently boasts the larges GSM market in the world boasting more than 360 million network users.

This represents more than 80% of all global cellular connections with more than two billion GSM compatible cell phones in use throughout the world.

At the time of this writing, there are more than 690 cell phone networks that provide GSM services to consumers across more than 210 countries. Since the first GSM network went live in Finland in 1991, the number of networks based on the technology has significantly increased over the past several decades. GSM operates in the 900 MHz or 1800 MHz frequency bands. Once compressed, the data is transmitted on a channel along with two additional streams of user information that are located in individual time slots. The GSM standard works by first digitizing and then compressing information. The GSM standard leverages a variant of TDMA (time division multiple access) and is the most deployed of the three competing legacy digital wireless technologies on the market today (GSM, TDMA, and CDMA). The Global System for Mobile Communications (GSM) system is a widely deployed digital mobile telephony standard that is deployed throughout Europe and other locations around the globe.

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