Smile cspire s3

sorry for asking this if it posted else were but i have searched for a couple days and cant seem to figure out how to switch sch-l710 s3 to a diffrent network CDMA.
i know you have to root it using the sprint way but it seems any post of people using the the rom the data wont work.
i am sorta a noob when it comes to phones but awesome with computer and can follow instructions greatly.
if someone could point me in right direction or anything would help