Now, Apple has offered an explanation for the error, claiming that people backstage didn't realise Face ID was trying to authenticate their face, causing the phone to request a passcode. And, just as Microsoft did in going from Windows 8 to Windows 10, Apple chose to skip a generation in its device numbering system, going straight from the iPhone 8 to the iPhone X (pictured above and pronounced "ten").
The iPhone X equips a near bezel-less 5.8-inch OLED Super Retina HD display with HDR, a 2,436 x 1,125 resolution and 458 PPI pixel density. The IR image and dot patterns create a mathematical model of a user's face and sends the data to a score platform to confirm a match.
All users have to do, Apple said at the annual September event dedicated to touting its latest product updates, is look at the iPhone X, which recognizes you as the registered user - even if you are wearing glasses or a hat or are sporting a new beard.
Apple's system appears to solve the technical problems; owners of the iPhone X are supposed to willingly "enroll" their faces from arm's length, turning their heads so facial contours are captured more fully.
Rattled, Federighi pressed the Sleep button to try unlocking the iPhone X with Face ID again, but the passcode screen still popped up.
The iPhone X uses the same camera technology as the iPhone 8 Plus - a dual-camera setup with a telephoto and wide-angle lens. The comparison is powered by a new A11 Bionic processor that contains dedicated neural networks to rapidly analyze thousands of data points. The iPhone X, on the other hand, comes later, with preorders opening on 27 October and a shipping date of 3 November.
On the subject of phablets, here's how the iPhone 8 Plus fares: the price begins at £799 for the 64GB version, and sharply rises to £949 for 256GB - putting it well ahead of the Note 8, and pretty much everything else out there.
Minnesota Vikings: Sam Bradford & the defense excelled in Week 1
Ingram has 96 catches in the last two seasons, allowing quarterback Drew Brees to have another weapon coming out of the backfield. But keep in mind, this was an O-line with rookie tackle Ryan Ramzcyk in place of pro-bowl caliber Left Tackle Terron Armstead .
Face ID projects more than 30,000 invisible IR dots. The screen includes 3D Touch, which allows you to execute different commands by pressing the screen with varying degrees of pressure.
One of the biggest changes is the lack of home button, which was one of the most widely-discussed rumours in the months leading up to the launch.
The iPhone X's 12MP camera is the same - on the surface - as the iPhone 7's, but boasts a lot more in terms of its software capabilities. With Face ID, it's 1 in 1 million.
It's faster than ever before, too, recording 4K video at 60fps and slo-mo videos in 1080p at 240fps.
They have additionally sought to raise awareness about the massive commercial databases kept by Facebook and Google, both of which in some circumstances use facial recognition technology to identify people depicted in photos users upload.
With the iPhone X, the Touch ID fingerprint sensor is a goner and the future is Face ID. This succeeds the fingerprint-based biometric technology we had seen in the iPhones for many years now, called Touch ID.
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