using maxis postpaid here .. it works .. but wasn't a smooth ride ...
here's the list of things i did before it worked.

1) install yellowsn0w through Cydia ( including Remove / Reinstalling as well )
2) Tried all the various methods to get signals but coudln't get any. ( Reset Network, BossPref Reset / Disabled Services etc )
3) Tried command line as well

It works when i used was doing the follwing: ( just a list , not in sequence though )
1) Turned off 3G / EDGE / Data Roaming
2) Installer to install yellowsn0w.
3) BossPref reset
4) Reset Network Setting
5) yellowsn0w terminal commands
5) Turning ON / OFF Airplane
6) It will begin to work when the SEARCHING word comes alive

btw, it doesn't work on my celcom non-3G prepaid though .. it was searching till No Service ..

Just keep trial and error .. Don't give up. I believe the model i had was the US model.

This post has been edited by error: Jan 3 2009, 06:39 PM