A little while back I wrote an article entitled Cellular Data to your Cisco Router – have you tried it? In this article, I talked about how I used a Kyocera KR1 cellular data router with a Sprint 3G cellular data card. Toward the end, I have a large section on the Cisco WIC cards that are available if you want to use cellular 3G with your Cisco router.
Recently, Cisco has begun offering 880 series routers that have 3G capabilities built in. Checkout the options for 3G in your Cisco router at- Cisco 800 3G Integrated Services Routers.