Coin Credit Card Review (see bottom for running Worked, Failed totals). Last night I received my new Coin and today I used it. Read on for the details.     Coin is a single point credit card device that can store all of your credit cards in one convenient place.   One by one I swiped my credit cards into the Coin credit card device using the supplied credit card swiper, entered the CVV and my billing zip code into the Coin app on my iPhone an...