The caller is a trusted individual or some institution and is a secure caller.
Callers are phone scammers who can make you lose money and reveal valuable personal information.
These calls are calls you haven't heard. You can't be sure who the caller is.
These callers are deliberately harassing intentional pranks or perverts that can seriously affect your life.
Usually a pre-recorded voice call, many about surveys, advertisements, etc.
Vote for the type of caller not summarized above.