Communications engineering. Cellular radio is a telecommunications network to transfer information by using radiofrequency electromagnetic fields between mobile users and fixed base stations. The most common application is the use of mobile phones which are operated in several standards with different frequency ranges, for example: GSM-900 (890-915 MHz and 935-960 MHz), GSM-1800 (1,710-1,785 MHz and 1,805-1,880 MHz), UMTS (1,920-1,980 MHz and 2,110-2,170 MHz) and LTE (700 MHz, 800 MHz, 1,8 GHz, 2 GHz and 2,6 GHz).
Further applications are cordless phones (DECT 1,880–1,900 MHz), TETRA (385–390 MHz, 395–400 MHz, 410–430 MHz, 450–470 MHz, 570–876 MHz und 915–933 MHz) and amateur radio (3.5–29.7 MHz).
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