Should You Sign Your Credit Card?
I had an interesting conversation with a friend this evening. He had read an article that suggested that instead of signing the back of your credit card, you instead place “Check ID” in place of the signature. The theory goes that if someone got hold of your credit card, when they purchased something and the sales clerk went to check the signature, the message would show thus eliciting a request to see another form of ID. If it is you, you can simply show your driver’s license and there is no problem, but if the person who stole it tries to show ID, it may be a bit more complicated for them.
There are, however, some problems with this. From my own experiences in Japan, there are very few people who check the signature on the back of a credit card. While I have been back in the US for a short time, it seems that it continues to be the same here from the times I have used the credit card here. If nobody checks the signature in the first place, then there is little chance for anyone to check for further ID.
Furthermore, if you don’t sign your credit card, it isn’t legally valid and any merchant could refuse to take (if they do, they could be help liable for any theft instead of the credit card company). Again, if they aren’t checking the signature in the first place, this isn’t a problem, but who wants to get in a fight with a sales clerk that refused to take your credit card because you haven’t signed it?
While having your credit card stolen is a possibility, I think that the bigger threat is having your credit card information skimmed as was done with my father recently. In this case, it makes no difference on how you sign the back of your credit card.
It’s an interesting topic - does anyone take specific steps such as not signing their credit card to make it more difficult for credit card thieves?

I sign all my cards. When I worked in retail as a cashier, if I got an unsigned card or a card that said something like “See ID,” I would refuse to accept it. The customers would try to present an ID, but I would say that it’s against our merchant agreement with the card companies to accept cards that aren’t signed.
Also, if your card is signed, you CANNOT be asked to present ID as a condition of the sale. That’s also in the merchant’s agreement. If they still insist on ID, you can report them to the card company and they might have their ability to accept that type of card revoked.
If I’m ever asked for ID when presenting a signed card, I’ll spend the time to educate the poor cashier on this fact if I have an extra minute or two. So far, nobody’s refused a sale because I wouldn’t present ID, but I’m sure that time will come.
As far as credit card thieves, they’ll be able to use my card whether or not the card is signed. As long as I sign my card, however, VISA or MC or whoever will give me my money back and then it’s the card company’s problem. I mean, think about it. Say you write “See ID” on the back. Then your card is stolen, and I thief tries to use it at a store. Some cashier does what the card says and asks for ID. Either the thief presents the wrong ID or refuses. What’s the cashier gonna do? Tackle the guy? Ask them to hold still while the police come to arrest him?
It’s not up to you or me or even merchants to stop credit card theft. It’s up to the credit card companies working with police. You can still take measures to keep your card from getting stolen, but if it’s removed from your possession, then nothing you do to the card will keep it from being used short of reporting the theft to your card issuer.