I ran this idea past NWC's wireless expert, Frank Bulk. He tells me there is such a feature, called "multi-NAM." It's a broken version of what I want. Basically, only one number is active at a time, and it's up to you to switch between them. Good luck managing that. So, Molta is right--this is the sort of half-thinking you get when you leave the device design in the hands of those who have a vested interested in limiting user capabilities. Imagine Verizon and AT&T services on the same device. I doubt the Earth's rotational momentum could stand the strain.
Art Wittmann is editor in chief of Network Computing. Write to him at email@example.com.