How to unlock my iPhone 4 with Gevey Ultra?

I have an iPhone 4 on baseband 03.10.01 and on firmware 5.1.1. How do I unlock the phone with the Gevey Ultra? I can't restore the official firmware without updating the baseband which will make my phone not unlockable. I also don't have an AT&T sim card. ApplenBerry says that only the redsn0w jailbreak was supported. So what do I do? I've been to the site and followed the steps, but I don't get that popup on step 2 and I don't have sim applications under phone in settings.

Yes you can unlock this by a gevey sim. No need to jailbreak this.

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