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美国的GSM是1900MHz. 

美国的GSM是1900MHz.
如果你确实要去美国,请带一部三频(或四频)手机.

双频:900/1800MHz
三频:900/1800/1900MHz
四频:850/900/18001900MHz

另外美国的手机多数是不插卡的CDMA手机,办理时一定要办理GSM 1900的卡.

（采用CDMA技术路线的是Sprint和Verizon，而采用GSM路线的是Cingular、AT&T、VoiceStream和Nextel。）
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