One of the most popular scams involves creating urgency and fear in the recipient prompting them to call back and pay fines or bills. If you suspect a number calling you is spam, look up the company's phone number and contact it directly. Even if the number looks legitimate, it's a good idea to call the company back using an official phone number (one you find using Google, a piece of mail, etc.). At one time, spammers spoofed AT&T's customer service phone number to collect payments and stole the customer's money. Therefore, giving your payment information to someone who calls you is never a good idea.