Did you receive a phone call from a number you didn’t recognize? If you didn’t answer and the caller didn’t leave a voicemail, you can check the number. The White Pages Reverse Phone lookup has been documenting if spam activity is suspected from a number. There is no charge for seeing this information.
This spam activity is illegal according to the Federal Trade Commission, especially if you have been on the Do Not Call Registry for more than 31 days.
If your phone provider offers free call blocking, consider adding any of these numbers to that list.