Hi U2,  the card is a 5821e, the issue was that it was not seating in the slot, like many sim cards that are inserted into a pc, you push it in and it clicks when you want to remove it you push on it and it pops back. In my case it was not clicking in. once i fiddled with it (technical term) it clicked in and everything is fine. Not sure where tech support was going with not being able to add the WWAN card after the fact. Thank you for reaching out!
Hello all, I have new to me Dell refurb 7424 Rugged, it has GPS wireless, and I added a WWAN card, it sees it in the Rugged control panel, device manager etc. but cannot sense the SIM card. is there something that I am missing? historically we have been able to add the card assuming the antenna wires were there. In this case they are. Support is telling me that since it did not come with the card, they can't help me.  any help would be appreciated! thanks 
DELL 7424 Rugged extreme and WWAN card