The Kyocera KR1 and the ExpressCards EX720 and V740 work with the firmware version 1.008. It has some speed issues and the performance isn't the best.
Kyocera released a firmware version (1.010) a while ago, with that firmware version Kyocera is claiming that it doesn't support the cards at all.
CradlePoint USB Router + Sprint EX720 + SIIG Express Card to USB Adapter
The Sprint Novatel EX720(http://www.rfwel.com/shop/catalog/Sp...ss-p-1006.html) can now be supported by the CradlePoint USB Cellular Router(http://www.rfwel.com/shop/catalog/Cr...r-p-1061.html), via the SIIG Express Card to USB adapter(http://www.rfwel.com/shop/?target=pr...cat=97&page=1). The Cradlepoint is a small, handy router that will prove to be useful when size is an issue. Its tiny design makes it one of the smallest broadband routers in the market, yet it can do the same job other popular routers such as the Kyocera KR1 can do.