还有一种电话卡与上述的电话卡不同。因为它是一次性电话卡，因此，你得先付费才能使用。
A phone card is different, as it is only a one-use card. You must also pay in advance to use a phone card.
西科姆与家庭一次性签订至少五年的服务协议，用户以月租的模式付费。
West Colm and the family disposable signs five years service agreement, the user pays expenses at least by the monthly rent pattern.
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