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Fixed Dialing Number (FDN) is a service mode of a GSM mobile phone's SIM card. [1] Numbers are added to the FDN list, and when activated, FDN restricts outgoing calls to only those numbers listed, or to numbers with certain prefixes. [1] A notable exception is that emergency calls to 000, 112, 911, 999 and the like are exempt. [2]

2025年2月11日 · Fixed Dialing Numbers (FDN) restrict outgoing calls to a preset list. To enable/disable, go to Phone settings > SIM settings > FDN, and enter your PIN2 code.

2016年4月21日 · Fixed Dialing Number (FDN) is a service mode of a GSM phone's Subscriber Identity Module (SIM) card. Numbers are added to the FDN list, and when activated, FDN restricts outgoing calls to only those numbers listed, or to numbers with certain prefixes.

如果SIM卡上的FDN启用，但ME不支持FDN, ME应该允许紧急呼叫，但不应该允许任何 主叫语音和主叫短信。 如果SIM卡上的BDN启用， ME不支持呼叫控制， ME就应该允许紧急呼叫，但不应该允许 主叫语音。 为了确定FDN功能的状态， ME应该检查EF_UST和EF_EST的FDN标志都是激活的（服务激活且可用）。 其他情况， FDN是关闭的。 UST需要打开 89 （eCall Data）或者 112号服务（eCall Data over IMS）， eCall功能才可用。 这些号码用于通过CS来执行eCall. …

2023年12月11日 · Fixed Dialing Numbers, also known as Fixed Dialing Mode, is a common feature on GSM mobile phones that allows users to restrict outgoing calls to only a specific list of pre-approved numbers. Once FDN is activated, the phone will block calls attempts to any numbers not on the FDN list, with the exception of emergency service numbers.

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2021年10月19日 · Fixed dialing allows you to block outgoing calls (except emergency calls), while incoming calls are not restricted. Fixed dialing numbers (FDN) on the Android smartphone must be enbaled in the phone settings using PIN2. We can also create a list of phone numbers that are allowed to be called.

2020年10月13日 · FDN (Fixed Dialling Number) or FDM (Fixed Dialling Mode) is a service mode of GSM phone's Subscriber Identity Module (SIM) card feature that allows the phone to be "locked" so that it can only dial certain numbers, or numbers with certain prefixes.Incoming calls are not affected by FDN service.