Convenient transaction cards are provided that may be attached or interconnected with portable electronic devices, such as, for example, cellular telephones, PDAs, MP3 players, the iPod.TM. digital music device, and other like portable electronic music devices. The transaction cards may be foldable to provide for convenient storage and access of the transaction card when utilized. In addition, the transaction cards may be provided within a case or a housing that may be removable from the electronic device.