The iPhone DevTeam finally released their new version of ultrasnow which can finally let you insert your Smart and Sun Cellular sim cards to your iPhone 3G/3Gs and iPhone 4.
This version of Ultrasnow works with the following basebands:
iPhone4 baseband 01.59
3G/3Gs basebands 04.26.08, 05.11.07, 05.12.01 and 05.13.04
1. Load Cydia and add source: repo666.ultrasn0w.com
2. Install ultrasn0w
3. Respring your iPhone
4. Enjoy your new unlocked iPhone
If you’re a nerd like me and you wish to install Ultrasnow via command line, then you might want to download this debian file.