What is meaning of frequency band in mobile?

In telecommunication, a band – sometimes called a frequency band – is a specific range of frequencies in the radio frequency (RF) spectrum , which is divided among ranges from very low frequencies (vlf) to extremely high frequencies (ehf). Each band has a defined upper and lower frequency limit.

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Nowadays, mobile phones primarily use three technologies based on antenna cell networks. GSM (or 2nd generation mobile telephony – 2G) runs on the 900 MHz and 1800 MHz frequency bands.