Verizon Broadband (USB720) ?

[Greg Troxel]

  I have a Verizon Broadband USB720 modem for my Mac.

I have not used that model, but used a KPC650 (550?) PC Card under
NetBSD.  It had an ohci, uhub, and something that was a serial adaptor
with two bulk endpoints.  It's possible this adaptor is just the
ugensa/ucom part. So I'd try to add the usb device id to the list in the
"generic serial driver".  My impression is that the "ugensa" support in
NetBSD is very similar to a driver with a slighly different name in
FreeBSD (I don't remember which way the code flowed).