Ignacio Mas of the Gates Foundation points out that ensuring secure text-message transactions will often require an agreement with a mobile operator, which controls access to the phone's SIM card.
盖茨基金会的IgnacioMas指出，为了确保短信交易的安全，通常要同控制手机SIM卡访问的移动运营商签署协议。
A personal identification number which provides access to protected areas of the SIM e. g. barred phone books.
个人识别码，用来保护SIM卡中受保护的数据区，例如：限制访问的电话簿。
A personal identification number which provides access to protected areas of the SIM e. g. barred phone books.
个人识别码，用来保护SIM卡中受保护的数据区，例如：限制访问的电话簿。
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