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众所周知,GSM手机用户在购机时会得到一张SIM卡或者“带机入网”,买一张有效的SIM卡。SIM是“用户识别模块”的缩写。因为有了SIM卡,手机可以不固定于一个用户。任何一个移动用户用自己的SIM卡可以使用不同的手机。
As we all know, GSM mobile phone users in the purchase will get a SIM card or “bring the machine network” to buy a valid SIM card. SIM is an abbreviation of “Subscriber Identity Module”. Because of the SIM card, the phone can not be fixed to a user. Any mobile user can use a different phone with his own SIM card.