This is the Easiest way to get your MSL code for your Samsung Prevail including all CDMA Android smart phones. Just go to your Android Market and download Terminal Emulator.
And Type in "su" (for super user access)
And then type "getprop ril.MSL" (then enter to get you Device's MSL code)
And Type in "su" (for super user access)
And then type "getprop ril.MSL" (then enter to get you Device's MSL code)