Use the HSPL unlocker to unlock your phone from here:
http://forum.ppcgeeks.com/cdma-tp2-u...w-hardspl.html
For the SIM unlocker, go here:
http://forum.ppcgeeks.com/cdma-tp2-u...-unlocker.html
After you unlock your phone (HSPL unlocker) go to
here to find a suitable custom rom that you would like to use.
Read the first couple of posts of both the unlocking threads above. If you have any questions, search within those threads for an answer first. If you can't find one after that or no one else had the same problem/issue/question as you, post in the thread and wait for a reply.