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一、SIM卡常识 SIM卡(Subseriber Identity Module),即用户识别卡,是全球通数字移动电话的一张个人资料卡。它采用A级加密方法制作,存储着用户的数据、鉴权方法及密钥,可供GSM系统对用户身份进行鉴别。同时,用户通过它完成与系统的连接和信息的交换。SIM卡的使用,有效的防止了盗用、并机和通话被窃听,使用户的正常通信得到了可靠的保障。移动电话只有装上SIM卡才能使用。“SIM卡”有大卡和小卡之分,功能完全相同,现在的SIM卡一般
First, the SIM card common sense SIM card (Subseriber Identity Module), that is, user identification card, is a global digital mobile phone a personal information card. It uses A-level encryption method to create, store the user’s data, authentication methods and keys for the GSM system to identify users. At the same time, the user through it to complete the system connection and exchange of information. The use of SIM card, effectively prevent theft, and machine and call eavesdropping, so that the user’s normal communication has been a reliable guarantee. Mobile phones can only be used if they have a SIM card installed. “SIM card” has a large card and small card points, the same function, the current SIM card in general