3g or USB Air cards in the United States

Question, has anyone gotten the routerboards to work with USB air cards in the United States market, or the 411U with sim card slot for th 3G networks?

I need to use an air card from Verizon Wireless and/or ATT here in the United States for a hotspot location for failover purposes.

THank you in advance for your help.

Look here http://wiki.mikrotik.com/wiki/Supported_Hardware#3G_cards

Yep..

I use 3 dif cards from Sprint.. 598U, 300U, 301U