Good Day
I have a Dell Vostro 3460 with a Dell WWAN card Dw5560.
I have the same problem.
I have installed the latest MB Bios
followed all the advice above.
I can see the device in device manager - the driver is not the issue.
The Dell Mobile Wireless broadband software does NOT recognize the WWAN card - it sais no device
but the device is in Divice manager.
Why did Windows 8 ship without mobile broadband software pre-installed?
I have logged support call and no answers yet, I am starting to freak out