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Note for T-mobile USA user: Please ensure you disable 3G service before installing ultrasn0w.
To Unlock iPhone 4, just follow these procedures:
Step 1: Upgrade your iTunes to iTunes 9.2 version or latest and backup your iPhone data by synchronizing it with iTunes 9.2.
Step 2: Use PwnageTool or Redsn0w or JailbreakMe to jailbreak your iPhone 4.
Step 3: Launch Cydia on iPhone and add “http://repo666.ultrasn0w.com” as the new repository URL. You can simply tap “Manage” -> “Sources” -> “Edit” -> “Add” to add the repository URL. If your not clear about this, checkout my post here on how to add sources to Cydia.
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Step 4: Then tap “Search” and search for “ultrasn0w” application
Step 5: Install “ultrasn0w”
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