https://www.reddit.com/r/LifeProTips/comments/68mot6/lpt_keep_the_phone_numbers_on_the_back_of_your/
origin - http://www.pipiscrew.com/2017/05/keep-the-phone-numbers-on-the-back-of-your-creditdebit-cards-on-a-list-in-a-safe-place-if-your-walletpurse-ever-gets-lost-or-stolen-you-can-cancel-the-cards-quickly-without-having-to-search-for-th/ keep-the-phone-numbers-on-the-back-of-your-creditdebit-cards-on-a-list-in-a-safe-place-if-your-walletpurse-ever-gets-lost-or-stolen-you-can-cancel-the-cards-quickly-without-having-to-search-for-th