The UK also does "chip and pin" authentication for requests, so the waitstaff are forced to either bring a portable cardreader to you or for you to walk to a terminal and enter a code. I think this is why mobile card readers are so common.
In the US, most credit card transactions are simply "(swipe or chip)". If you have the card, you can use it. Gas stations seem to be the slight exception in America -- they generally require "(swipe or chip) and billing zipcode". This is quite funky and not at all secure against fraud.
In the US a few months ago, a food truck used one of those carbon copy card swiper things. And yesterday I tried to pay for a cabin reservation and the lady took it down over the phone and said she'd run it next week. Many grocery stores and gas stations still swipe. Our tax people still use faxes and our hospitals manually create and deliver CD-ROMs for medical imaging. We're not a very advanced country, lol.
I wish swipe/on card numbers were completely gone here and chip only too. I use my phone for most purchases, but most restaurants here haven't caught up on wireless pay.
