What Is Band?

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A band is a range of frequencies in the electromagnetic radio spectrum. Different bands are reserved for other applications, such as radio broadcasting or citizen's band. In mobile telephony, a band is any range of frequencies in the radio spectrum's ultra-high frequency (UHF) band. Telephony bands are regulated and licensed to operators that provide mobile phone services. The UHF spectrum is used by mobile phones for voice calls, text messages, and mobile data transmission. The UHF band is broken down into paired channels called duplexes. Each duplex is divided into two halves: the uplink (from phone to base station) and the downlink (from the base station to phone). It might not be your fault if you've ever wondered why your phone doesn't work in a different country. Mobile phones use different frequencies to send information back and forth. If the network or service provider doesn't support these frequencies, you're using them. Your phone won't be able to connect. For example, the Global System for Mobile Communications (GSM) 1800 operates from 1710-1880 MHz. A 1710-1785 MHz band sends information from a mobile device to a base transceiver, while an 1805-1880 MHz band sends data in the opposite direction. Typically, bands are auctioned by the government. When the government licenses a band to a mobile provider, the provider operates only in the specified band. Additional band operations require additional licenses. Most modern mobile devices are known as multiband because they support multiple bands. There are three main types of multiband phones: Dual band: Supports only two bands. Tri-band: Supports 850, 1800 and 1900 MHz bands. Quad-band: Supports the four GSM spectrum bands: 850, 900, 1800, and 1900 MHzSome phone support bands are supported by different standards. For example, a Nokia 6340i GAIT phone version supports 1900 and 1800 GSM bands, 1900 and 800-time division multiple access (TDMA) bands and the 800 advanced mobile phone service band. A mobile phone with a multiband feature is handy for world roaming because countries employ different frequency bands.

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