September 13, 2016
to all eligible iOS devices. While Apple did not give any info at what time exactly the update will be seeded to your iPhone or iPad, we have a few educated guesses up our sleeves.
During previous iOS rollouts, Apple has begun releasing its new OS around 10 AM Pacific time, meaning that the majority of the USA got it by noon or a few hours later in the worst case scenarios. Meanwhile, this means that European users will be getting it sometime in the evening, whereas the eastmost parts of Asia will likely get it in the early hours of September 14. Here's a useful table that will show you when iOS 10 will likely arrive in some of the major time zones:
This way, a large portion of all active iOS devices will already be on iOS 10 when the iPhone 7 and 7 Plus see the light of day three days later, on September 16. As far as eligible devices go, you will find a full list right below. Notice that the iPhone 4s won't be getting iOS 10:
Note: If you have been enrolled in Apple's beta program and have been rocking iOS 10 beta for the past few months, the golden master of iOS 10 should already be rolling to your device.
Also have in mind that certain new iOS 10 features will only be available on select newer devices. For example, Raise to wake requires and iPhone SE, iPhone 6s, or later - the iPhone 5, 5c, as well as iPhone 6 and 6 Plus are not compliant with that feature.