The basic system of DCS1800 MHZ is exactly the same as that of the existing GSM900 system, but it works in the 1800 MHz frequency band and requires a GSM 1800 mobile phone. If you use a dual-band mobile phone, you can also roam and switch automatically in the G network. In many cities, the DCS1800 system and the GSM900 system cover an area at the same time, which is called the GSM dual-frequency system, which doubles the capacity of the GSM mobile communication system.
DCS 1800MHZ is mostly used for radio signal transmission, and many radio enthusiasts will use this frequency band.