在電話選項裡面有個FDN電話清單，那是什麼功用的???
Fixed Dialing Number (FDN) is a service mode of SIM, where outgoing calls are allowed to only a set of phone numbers. These numbers are added to the FDN list.
The most common practical application of FDN is for parents to restrict the phone numbers to which their children can dial.
轉自維基百科
固定撥號，只有名單裡的電話號碼能撥出(開啟FDN之後生效，須配合PIN2碼，還要看電信業者有無支援)
我沒黑梅，但是應該是這樣沒錯的
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