Can Whoscall provide information about unknown numbers? Whoscall Service Center September 10, 2020 07:27 An unknown number is impossible to trace or reveal through any app or device. Related articles Does Whoscall identify SMS as well? How to activate the "Caller Identification" function? I activated the "Caller Identification" function, but why are there still some numbers unknown? Why is “Call Blocking & Identification” turned off? Why can’t I find it? Is there going to pop up a dialog, when there's an incoming call? Comments 0 comments Article is closed for comments.