used the numerous guide on this board.
after going from 1.1.1 to 1.1.2 and back about 3 or 4 times (due to sms and phone.app crashing in 1.1.2), the final piece of the puzzle for me was on this page.
http://c o d e . g o o g l e . c o m/p/iphone-elite/wiki/fix_crashing_phone_sms_apps
had to hexedit AppSupport...I also created 2 other files (Optus.plist and the MCC MNC file, along with some chages using a text editor) but not sure I did that correctly....but hey, its working
used winscp to replace lockdown after 1.1.2 jailbreak...you can still scp to phone despite it sitting on the new 'restore mode' screen.
make sure you do 'upgrade' and not 'restore' when moving to 1.1.2
took me many hours but it does work....
cant find EDGE setting under network anymore...possibly defined in the plist files now...as I saw references to APN's, username etc in the files I was editing.
Australian number formatting now works.