Linksys WRT54-3G Mobile Broadband router and Cingular Sierra 875 3G aircard compatibilty?

Does any one know of the compatibility of the Linksys wrt54g-3g mobile
broadband router and the new Sierra 875 3g broadband wireless card being
offered by Cingular. I have googled on the router and have seen it being
used in England and Australia with their specific 3g providers. Linksys
shows on their website that it will work with a Sprint Mobile broadband card
here in the US. Is the router capable of using any mobile broaband card as
long as it meets the minimum PC card slot requirements or is a special sim
needed. I live in an area where I can only get Internet access by Dial-up.
There is no cable or standard DSL/broadband available. I would like to use
the router and card setup for my internet access. I know the options are a
little bit pricey for the Cingular Data packages. But, they are not bad when
considerring the speed inprovement over Dial-up. The area I live in is
scheduled for 3g network installation by Feb 2007. It will cover the Reno,
Nv area. I live within the unobstructed line of site of the mountain that
will have the 3g equipment installed upon it. As for equipment to be used
with it, everything will be Linksys items designed for home or business as
needed. I appreciate the assistance.



Thanks,

Terry D.