Quick meaning
A call where the caller's number is hidden or not recognised by your phone.
Think of it like this
Like a knock at the door from someone you cannot see through the peephole.
Where you may see this
You may hear this in email apps, messaging apps, video calls, and workplace instructions.
Why it matters
Knowing the term makes it easier to message people correctly and avoid simple communication mistakes.
Say it simply
Unknown Caller means: A call where the caller's number is hidden or not recognised by your phone.