Verizon said Wednesday the data of 6 million users had been leaked online.
If you're a Verizon customer, what should you do?
Change your password, for a start.
Verizon is telling customers that the leak, made by a vendor's placement of the information in a cloud system that was available to external access, didn't result in "loss or theft of Verizon or Verizon customer information."
But security experts always advise playing it safe. Switch your password and monitor bank and credit card accounts.
Verizon spokesman David Samberg also says to be cautious of any suspicious calls or emails, as they could be phishing attempts.
"Be very careful of personal info you give out to callers who claim to be from your bank, cell company, etc. Call the company to verify if you are not sure the call was legitimate," he said.
Passwords should strong and long, and changed frequently — like how often you change your clocks or use a new toothbrush.
But if you use the name of your pet as a password, it better be good.