The link ripplelet provided is for the SIM unlocker, if your on a Sprint phone and want to be able to use the SIM for US carriers, but it doesn't seem like that's the case. If you're looking for the HSPL to unlock the phone so you can flash custom ROM's, there's a thread in the about that also, but IDK off hand if your carrier is CDMA or GSM and you need to make sure you're using the right one. Here's a link for the CDMA unlocker, but you need to make sure this is what you're looking for and that your phone is CDMA.
http://forum.ppcgeeks.com/cdma-tp2-d...w-hardspl.html