Add an additional SD Card?
 

I want to add another SD card slot so that I can access an additional memory card while I have my WIFI card in. Assuming that the connector has the same pins as documented here(http://www.shadowmite.com/650serial.html), is there a way that I can communicate over the RX/TX pins? I would like to be able to connect a mcu to the pins and talk to it with a program on the phone.