I'm looking to come up with a good way to managing our army of air cards and cell phones. They're mostly AT&T which have a SIM and a device whereas the Sprint and Verizon devices have no SIM. I was thinking of making an asset for SIM's and making fields for the phone and SIM # in it. Then I could create an asset for the phone or air card   and somehow associating a SIM with a device. Is this a possibility?

How are you guys handling this?