Blocking of Private and Unknown calls is also available.

封闭的私人和未知的要求也可以。

youdao

Are you receiving lots of calls from unknown Numbers?

您是否收到太多陌生来电？

youdao

To this day, Horwitz accidentally calls Hernandez once a month, for reasons unknown to both men.

WSJ: The King of the Accidental Phone Call

Lee was adamant that an unknown was needed for Pi, so he put out casting calls for 3, 000 young actors across India.

BBC: The challenge of bringing Pi to life