Although the feature was shown off at the Apple event back in September, it hasn't actually been available for the public use. The Portrait mode appeared to work quite well when demoed on stage, but even since then we've been dying to try out the feature for ourselves. Thankfully that's changing today with the third update for the iOS 10.1 beta. In the update for the beta, Portrait mode for the iPhone 7 Plus is finally making its way to the general public - in addition to a host of other bug fixes and minor tweaks. Although we wish that the Portrait mode feature had made its way to everyone at this point, seeing it move to the beta version of iOS 10.1 is still promising for a full-fledged release in the near future.
If you happen to have the iOS 10.1 beta running on your iPhone 7 Plus, you should have an update waiting for you for the third version of it that includes the various bug fixes and access to Portrait mode. This certainly is a big addition to the 7 Plus, so if you get a chance to test it out be sure to comment below your thoughts about how it works for you in the real world.