The present invention relates to a method and an apparatus for recommending content and updating user proprofile. A mobile device calls a PBX over a voice channel, and phone number identifier information is obtained and matched to identifier information for devices that known to use the PBX. The radiography device can include a source of radiography signals positioned to direct radiography signals through at least a portion of the device and a detector to detect radiography signals that have passed through the device. A method for producing a sampling swab that is substantially free of impurities and detection interferants is also provided.