Warren Kring knows how to spot a scam. He s an IT manager and it s what he s paid to do.

I get those kind of calls all day long, said Kring. You just have to filter them through and get rid of them - or don't answer them.

But he did answer a recent one. It came to his cell phone. The caller claimed to be with his mobile carrier T-Mobile.

He was doing a survey, he worked with corporate, said Kring.

Kring was offered $200 for the survey. He just needed to provide his zip code and information in a text message he would receive.

It looks like the kind of text message you get when you've forgotten your password and it says we're going to send you a reset code. I said, wait a minute this looks kind of fishy, explained Kring.

He was right. The information is exactly what you need to reset a password on T-Mobile's website. Once you're in you may be able to make purchases under someone else's account. Also, the phone number that shows up for these calls is the same as the company's customer service. It's a technique known as 'spoofing' and this IT guy knows it's not hard to do.

I run the phone system here and so I know all about caller ID and stuff. I can make my number be anything and so you really can't trust a phone number, said Kring.

We've been hearing about this happening recently to customers from other carriers too. T-Mobile tells me Warren's call didn't from the company. Remember, your carrier knows who you are and shouldn't ask for personal information. So be on alert and if you get one of these calls, hang up and then report it to your carrier. A couple hundred bucks isn't worth your financial security.

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