Got it working but I am not sure how. I made sure to delete everything related to WWAN however. Restarted windows to make sure that it is absolutely not able to reinstall anything on its own. I installed some random drivers from 2012 and those worked well. Now I have 7.2.3.0 and those work too.
I was used to right-clicking the Dell Mobile Broadband Manager tray icon and turning the 5560 WWAN card on and off. Some days ago Dell Command Update updated it and I can't turn it back on. Tried removing drivers, manager, reverting to older drivers, updating firmware - nothing. It just says the device is not communicating and gives me no options to turn the software switch back on. HW switch is on. What else can I try? Where can I get older Broadband manager versions?Win7 Pro 64. 6430u.  EDIT: I just booted into Ubuntu and WWAN is working fine there.EDIT2: I also tried manager version 7.1.0.2 - same results. Anything older still?
No soft-switch to turn on WWAN after Dell Broadband Manager update