for your problem, lenovo is not hte cause, it is infocomm developement authority issue.
i heard ida charge each device a levy for being able to carry and use a sim card. therefore for each slot the levy multiply. therefore there are little or no computer dares to be ida approved.
instead of ida. i think there are not much developement at all.
I also have Leovo B460. I was trying to use the sim card slots to use the internet connection,But i can't get it. Can any one suggest something ????