I received the Network Unlock code from AT&T. Inserted a T-Mobile sim card, and when I entered the unlock code it was unsuccessful. I have seen comments that Network Unlock will only work from stock, but none of the comments seemed very authoritative.
Do I need to revert to stock in order to unlock the phone? If so, will this method http://forum.xda-developers.com/show....php?t=2722660 get me what I need? If there is another way to do this, or something else is wrong, I'd like to know about it before going through this.