How is spectrum allocation done?

They are divided into bands based on frequencies (see ‘Radio spectrum’). Mobile phones use two technologies based on different parts of the radio spectrum— GSM (global system for mobile communications) and CDMA (code division multiple access). Most of the radio spectrum is reserved in countries for defence.

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What is spectrum and band?

Portions of electromagnetic spectrum are grouped in “bands” depending on their wavelengths—the distance over which the wave’s shape repeats . The full electromagnetic spectrum ranges from three Hz (extremely low frequency) to 300 EHz (gamma rays).

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