【常识篇】实用攻略！在国外如何办一张手机SIM卡？

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笔记： 

Prepaid- A SIM car you have to pay for before using, not as good as a contracted SIM. 预付费手机卡

 Contracted SIM- A SIM card designed for people who are going to stay in America for an extended period of time. 签约合同制手机卡 

GSM／CDMA：通俗一点说就是两种不同的信号，用来提供无线数据服务的。中国的通常都是用的GSMGigabytes or GB- The amount of interest you’ll get when buying a SIM card. Usually come in 1,2, 4 and 10 GBs. 流量单位