Pay your attention please, in case you are one of AT&T users, you may have received this message early this morning notifying you that your FW need to be updated to iOS 4.2. And as most of you know, iOS 4.2.1 is still not unlockable on iPhone 4 and it's jailbreak is still tethered.
Below is the text message sent to AT&T users:
AT&T Free Msg: An important software update is available for your iPhone. To update to iOS 4.2, connect to iTunes and follow the instructions.