also there is a hybrid PRL that is said to have worked that uses both Alltel and Verizon towers or something like that.
heres the PRL:
http://www.megaupload.com/?d=2E0V336O
1)Take this , and put it on your phone's sd card. Don't put it in any folders on your sd card, just leave it at the front.
2) Go to the dialer and write, ##778 and press call, hold and you should get a pop up.
3) Select Edit Mode, then enter 000000 (6 zeros) as the password.
4) Slide down to PRL, and press Update PRL. ( Please wait a while, it takes some time)
5)Once there, slide down the keyboard and you should see the Hybrid PRL file,press on it, and then press OK.
6) It should bring you to the menu you were before, press the menu button on your phone and select Commit Modifications.
7) The phone will update and reboot.