A “Portable Card Generator” is implemented within a portable device, such as a
mobile phone, and provides various techniques for writing secure account information from user selected accounts to a “wildcard” having rewritable magnetic stripes, rewritable RFID tags, and / or rewritable smartcard circuitry. The account information is retrieved by the portable device from local or remote stores of user accounts. Once that account information is written, the wildcard is then available for immediate use for
credit card or debit-type payments, loyalty card use, etc. Consequently, by providing a
credit card sized object having a rewriteable magnetic stripe, RFID tag, and / or smartcard circuitry, in combination with account information for various credit cards, debit cards,
consumer loyalty cards, insurance cards, ID cards or badges, etc., the user is no longer required to physically carry those cards in order to use the corresponding accounts within existing card-based infrastructures.