PHILADELPHIA (CBS) — The best device to protect yourself against skimming thieves at the gas pump may be right in the palm of your hand.

Turns out, cellphones can help detect if a skimmer is hooked up to a gas pump.

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Hacking experts say thieves are now using Bluetooth technology.

To help detect a scam they recommend turning on your bluetooth before swiping your card.

They say if a long string of numbers or letters trying to connect pops up, chances are a skimming device has been set up.

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“It’s really cheap and easy for a bad guy to do and utilizing Bluetooth now takes away the physical component of having to go and check on a skimmer so they can be just 30 feet of a skimmer and steal the data that way,” said professional hacker Jon Waldmen.

Experts encourage anyone who notices suspicious connections to alert the gas station right away.

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