Android ICS 4.0 smart phone with OTG USB must be required to support USB Host functionality to work with the USB smart card readers. Most android smart phones with ICS 4.0 in the market are OTG enable and can connect the smart card readers by a OTG USB cable. Following is the smart phone list:

Here list the android tablets which have the USB HOST functionality can work with the generic USB smart card readers. Few tables are build-in the USB 2.0 port that you can plug the reader directly. Most are with Micro-USB  port which you'll need a OTG USB cable to connect your readers. The rest ones work on the Docking port with an USB adapter provided by the vendor.