Well i had this problem where my phone is flashed to metropcs, and i updated the rom by flashing it...and all the metropcs settings got wiped out, therefore icouldn't make calls or nothing...
But I FIXED IT WITH THE HELP OF LOGICAL_EVIL on howardforums!
UPDATE:::
In case YOURE HAVIN THE SAME PROBLEM. DO thIS:
Download this file:
http://www.4shared.com/file/12533993...28b/02002.html
to your comp. Extract it. Copy the extracted file to your phone's memory card.
next:
on your phone dial ##prl# (in my case it was ##775#)
Enter your unlock code.
Select update PRL
(you know when you press the little circle comes up)
yes.
select EDIT.
Select Browse, and there the PRL is going to come up...if not look for it where you copied it to.
Select Update PRL and it will restart the device.
and Will work.
if not let me know..