You’ve got to be pretty bold to use your iPhone to count cards in a Vegas casino, especially now that they’re on the lookout for such behavior.
Card counting itself is not illegal, but using a device to help you do so is considered a felony under Nevada gambling laws. Not that casinos are fans of card counting without devices. But if they catch you using this unnamed app they have a choice to either turn you over to the feds or handle your punishment themselves, neither of which seem like great options to me. [AP]