1. Please add the repo repo666.ultrasn0w.com to cydia or icy
2. Search for ‘ultrasn0w’ in cydia or icy and install ultrasn0w
3. Reboot your iPhone 3G
4. T-Mobile USA users should disable 3G before using ultrasn0w
5. Enjoy
i tried to unlock my iphone3g 3.0 with ultrasnow , i am using 02 carrier , i tried with T-Mobile , it is showing signals but unable to call and receive calls and some times signal is droping