If you receive a phone call and you don't recognize the number you can check it out on the following sitehttp://whocallsme.com/
"Recent Phone Call Reports
This is a user supplied database of phone numbers of telemarketers, non-profit organizations, charities, political surveyors, SCAM artists, and other companies that don't leave messages, disconnect once you answer, ignore the Do-Not-Call List regulations, and simply interrupt your day.
If you received a strange call, most likely you are not the only one. Search for this phone number to see the reports of others. If there are no reports yet, leave your comment to start a conversation"