A notification appears after every call from an unknown number asking you if the caller was spam. Click on the big red button and it will generate your first spam report.
What happens if you swiped away the notification?
You want to report a spam number that occurred before downloading Vibely?
Head to your Recent Calls in the application and click on the number. You will see the option to create a "Report". This will add the number automatically to your personal Blacklist and ensure other Vibely users will not receive the same call ever again!