Most credit cards would have a disclaimer on the back of the card that says "Not valid unless signed", so I assume you have to sign it.
I have a chip card and a pin set-up on it. So whenever I shop in Australia, I just swipe and use my pin instead of signing it. I'm not sure what options you have in other countries but when I was in the US earlier this year, they always asked me to sign.
The Hotels in Las Vegas always asked me for ID (Passport) as well when I used my credit card and they always asked me to sign, never got the option to use my Pin there. I assume because it's a foreign card, they need to check...and they seemed to be checking for name and signature match each time.
Also a good habit is to always make sure you have the card in your sights at all time if you have to hand it over, as it only takes a few seconds for someone to copy it. It's happened to my friend a few times and she still hasn't learned her lesson
She always hands her card and wait for the receipt to sign...at restaurants, shops, everywhere...and she had her card copied several times.
I've just received my new card and remember somebody advising to put "Photo ID required" on the card instead of my signature. Any ideas about what is better? We are doing a lot of overseas travel and I always worry about handing the card over with my signature on it.
Thanks