hi friends,
i have tried all ways to unlock this phone but failed..
details of the phone are like :
- model : Iphone 3GS
- untethered jailbreak using latest version of redsnow.
-serial no : xx943xxxxxx
-baseband : 6.15.00
-OS : iOS 5.0.1
i tried using ultrasnow 1.25 ; however the phone failed to detect the network, also i noticed that the phone frequently hanged and rebooted after the installation.

can anybody please guide me or show me some way to unlock this phone so that it can be used with any carrier.