If anyone tells you to buy iTunes cards to pay the IRS, qualify for a grant, get a loan or bail out a family member, say “No.” They’re trying to scam you. The only place to use an iTunes card is at the iTunes store, to buy online music, apps or books.

People have told the FTC about scammers who called and demanded iTunes cards as “payment.” Bogus “IRS agents” told people they owed back taxes and would be arrested soon, unless they bought an iTunes card and gave the code to the “agent.” Phony “government grant” officers called and promised a big payout, after the person bought an iTunes card and read the code to the “grant officer.” Other fraudsters told people their grandkids were in jail and the only way to help was — you guessed it — to buy an iTunes card and read the code over the phone. All the stories were false.

There’s a reason scammers insist on getting iTunes cards: Once you tell a scammer the code from the back of an iTunes card, he takes control of the value on the card. He can use the code or sell it. After a person redeems the code, you can’t get your money back.

If you gave someone the code from an iTunes card and you think it was a scam, call Apple Support at 1-800-275-2273 right away (you may have to spend some time on hold). Tell them what happened and ask if they can disable the card. Also, go back to the store that sold you the card and talk with their customer service staff. And if you hear from someone who wants you to send an iTunes card, please tell the FTC.