These days, almost every store has one of those "Loyalty Cards" they want to scan.

They're great for saving money. But bad if you like keeping your private information private.

What to do?

Well, according to Yahoo News, just give them a little 867-5309 action!

They sent people out all around the country to see if they could get discounts by using (area code) + 867-5309. And guess what? It worked. At every store!

Every place they went, someone had registered for one of the store cards using "Jenny's number."

The Yahoo story features a video going into more detail.

I wonder if it also works at places like Radio Shack that want your phone number to buy a AA battery???