We can listen in to a call while it is still at the ringing stage and within a fraction of a second know everything about the user. Then we can listen in to the call.
I got many emails that brought to my attention that Mr. Ioan Mang... plagiarised a manuscript of mine, as well as papers of other people.
Using a special device, it's possible to steal calls and impersonate callers in the middle of a call as it's happening.
Some biometric methods can't be taken from a person from afar without his or her agreement.
