Where does the Fastboot pull the information from?
the information comes from the misc partition.. /dev/block/platform/sdhci-tegra.3/by-name/misc

if you dd if=.... of=/sdcard/misc.img then do an adb pull /sdcard/misc.img you will see.. I stuffed up a root and had CDMA crap in there from one of the updates.. now no 3g either :)

but that's where it queries the information from.. doens't do an mdm_ctrl commands to extract it or anything.