I don't believe Ultrasn0w unlocks iPhone 4 yet. They can only unlock baseband versions up to 05.13.04 and apparently the iPhone 4 has a newer baseband than that. Patience, and watch
http://www.redmondpie.com for updates.
Edit: And just after I posted, I saw
this:
Quote:
iPhone 4 users though will have to wait for the next 48 hours before a new Ultrasn0w update is released which can jailbreak this new device. Stay tuned as we will let you know as soon as it is available for download, along with complete guide on how-to unlock your iPhone 4.
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