Issue: You launch Dell Mobile Broadband Manager (DMBM) or Dell ControlPoint Connection Manager, and you see the error: "Not Communicating," "No Device Found," or "Radio is Off." The application cannot initialize the mobile broadband card (often a DW55xx series from Sierra Wireless or Ericsson).
Windows 10/11: Action Center → Airplane mode must be OFF. dell mobile broadband manager not communicating
If you’ve completed all steps and still see "Not Communicating," the WWAN card has likely failed. Replacement DW5811e cards are available for $20–30 on eBay. Issue: You launch Dell Mobile Broadband Manager (DMBM)