(GSM900 and DCS1800 are the dual-band networks that we usually talk about, and they are both GSM standards. The functions of the two systems are the same, but the frequency is different. GSM900 works at 900MHZ, and DCS1800 works at 1800MHZ. The earliest use of GSM900 in China, with the rapid development of communication network design and the number of users)
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