See ugensa(4).

I have personally used:

           Qualcom CDMA MSM (found in Kyocera KPC650 EVDO interface)
           Sierra Aircard 580

with basically ok results.

<US-centric> The KPC650 is sold with Verizon EVDO service, and the
Aircard 580 with Sprint.  Were I starting fresh, I'd get a KPC650 with
Verizon service.
</US-centric>

The big bugs with these cards, and likely almost all
ohci/uhub/ugensa/ucom cards are:

  removing the card panics the system; use drvctl to detach first

  After losing a connection, sometimes a retry doesn't work cleanly.

In practice these are not too annoying.