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GSM is a digital mobile network that uses a combination of Frequency Division Multiple Access (FDMA) and Time Division Multiple Access (TDMA) to provide mobile communication services. It was first introduced in the 1990s and has since become the most widely used mobile network technology globally.

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Keep a GSM phone as a backup – battery life on idle can exceed 2 weeks, unlike 5G phones. GSM is a digital mobile network that uses