Comcast is the largest cable provider in the US with 21.5 million subscribers. The document provides an overview of the major companies in the telecom, wireless, broadband and field service markets including Sprint, AT&T, Verizon, Qwest, BellSouth, Cingular, Alltel and others. It estimates that these companies have over 160,000 mobile employees and the potential market for rugged laptops among their field service workers is estimated to be over $560 million over three years.