In order to use your cards with Dell Mobile Broadband Card Utility, you will need to change the Mobile Broadband carrier because, the software communicates by default with AT&T, Verizon, Sprint and Generic. To do that, press the
icon and from Settings select the Mobile Broadband carrier you want to connect with and your corresponding region. After that, press Connect or Activate. If you have issues, I suggest you follow the troubleshooting guides provided by the support team.