UltraSn0w
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- Has no race conditions, no popups about “Missing SIM”, no network issues
- Is almost 7000 times smaller than its nearest competition
- Is available now via Cydia. Source repo is http://repo666.ultrasn0w.com (that last “0” in ultrasn0w is a zero!)
Purplesn0w
- Works on only iPhone 3GS
- 3G(the network speed) issues fixed
- Now only patches one file, CommCenter
- Leaves no traces on your baseband after it runs. Seriously
- Much more clean and reliable.
He has provided the following instructions to unlock iPhone 3GS:
- Be sure to have legit activated 3GS
- Disable 3G if you don’t have it(like T-Mobile).
- Add apt.geohot.com to Cydia
- Install(or Update) com.geohot.purplesn0w
- Watch for success output in Cydia(actually do this step)
- Wait for signal, and enjoy your unlocked iPhone(no reboot required)
Source: iphonehacks

