Creative Fraudsters
However, that has changed. A new website allows credit card thieves to place phone calls and make the call appear as if it came from any phone number. So, credit card thieves can steal new cards from the mail and then find out what the card owner's home phone number is.
Using the website, they place a call to activate the card and make the call look as if it came from the card owner's home number. The card is activated, and the card can be used fraudulently.
What You Can Do
The best way to avoid becoming a victim of this scam is to watch your mail and keep track of incoming credit cards.
As your cards expire (or if you apply for a new card) you should expect to receive a freshly issued card in the mail. If you don't find out why. I'd suggest calling the card issuer just to get an idea on when you should expect your new card.
The scammers are creative and proactive. Therefore you should be too.

