If you've been using an iPhone 4 on basebands 3.10.01 or 2.10.04, your inability to unlock has undoubtedly been an issue of great concern.
Time and time again, we get our hopes up, only to come away disappointed.
Let's give Apple credit, they've done a decent job with keeping these basebands locked down for a significant amount of time, but the gates could be breached in the very near future...