wcdma 3g 频段band对应表：
Band 1 2,100 MHz
Band 2 1,900 MHz
Band 3 1,800 MHz
Band 4 2,100 / 1,700 MHz
Band 5 850 MHz (for the U.S.)
Band 6 850 MHz (for Japan)
Band 7 2,500 MHz
Band 8 900 MHz
Band 9 1,700 MHz (for Japan)
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