Apple is testing iPhone Duo 2 prototype with key upgrade

The first reviews of Apple's iPhone Duo are out, and the consensus is that it shows typical first-generation shortcomings. The most common complaint centers on the Touch ID sensor, which reviewers say can be hard to reach depending on how the device is held and requires holding a finger on the sensor to fully unlock the phone. That friction matters beyond one device. Biometric unlock is part of the everyday user experience, so small usability gaps can shape how people judge a whole product line. The story also notes that Face ID is a highly requested feature for the Duo successor, and reports say Apple is testing a key upgrade on a Duo 2 prototype. For product teams and designers, the takeaway is that first-gen form factors often live or die on the basics, like reach and unlock speed. For anyone following mobile hardware careers, it's a reminder that user feedback on early reviews is a useful signal for what the next iteration will need to prioritize.