Credit bureau TransUnion is warning mobile phone users to watch out for a scam that leverages SMS messages and voicemails.

"The scam revolves around phone users receiving a text message or voicemail stating that their credit card has been deactivated and then they are asked to call a number," writes The Last Watchdog's Byron Acohido.

"When the consumers call this number, a recorded message asks the caller for their 16-digit card number and for more personal information," Acohido writes.

Go to "ID theft scams spreading to smartphones" to read the details.

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