The present invention is generally directed to methods of manufacturing data card assemblies. These methods generally comprise manufacturing or purchasing a data card comprising a special number, wherein the special number is associated with a particular data card account; packaging the data cards in a package such that the special number is visible; generating activation information; reading the special number on the data card; recording the activation information on the package; and associating the special number with the particular activation information recorded on the package. Some embodiments of the present invention may further comprise conveying the association between the activation information and the special number to an intermediary managing the data card accounts. Some embodiments of the present invention may further comprise generating a special number associated with a particular data card account; and generating activation information associated with a particular special number.