I'm going to say that you don't need to have it connected to a pc, although you'll need to grab a few items first (and not necessarily in this order):
- a MSL grabber of some sort
- a Cricket PRL
- and your MSID/MIN from Cricket to activate
If you have a Sprint TP2, you'll need to get your MSL, you'll need to find the program and install it:
http://forum.ppcgeeks.com/showthread.php?t=97552
After that you can access QPST on your phone and enter the settings that are in the link of my previous post.