A positive number is from a legitimate caller. A negative number is from an unsolicited caller making unwanted calls.
On our website you can check and find out information about calls to your phone. And also help us to fill the database of numbers that violate the norms of using telephone numbers.
If you see the number that is marked SafeCaller then this number is "safe".
If the number is marked Not Safe, then most likely this number is seen in the spam and "unsafe".