Apple is testing iPhone Duo 2 prototype with this key upgrade

The iPhone Duo is now slowly making its way to users who placed their pre-orders last week and the first round of reviews are already out. The consensus is that it suffers from typical first-gen product shortcomings and most reviewers are not too fond of the Touch ID sensor. Depending on the orientation that you’re holding the device, it can be hard to reach and it also requires you to hold your finger on the sensor to fully unlock the phone.

It’s safe to say that Face ID is a highly requested feature for the Duo’s successor and Bloomberg’s Mark Gurman has already confirmed that Apple…