Millions of users were quick to access the latest free iOS software update when it became available, however some users have reported their smartphones and tablets crashing, with only a connection to a computer via USB fixing the issue.
Apple issued a statement confirming a "brief issue with the software update process affecting a small number of users during the first hour of availability", but this had now been fixed.
The free upgrade includes a variety of new features, including an overhauled Messages app with more emojis and animations, a new notification system for the lock screen and virtual assistant Siri being able to integrate into more apps.
Users of the iPhone and iPad in the UK with a compatible device - iPhone 5 and newer, or iPad mini 2 and newer - are eligible for the update.
Having been first revealed at the tech giant's developer conference in June, iOS 10 also sees more artificial intelligence implanted into the software, with the Photos app now better able to identify and show you photos in your library based on time, location, people and even the items in them.
The iOS keyboard has been given a similar intelligence boost, Apple says, and is now able to better understand context as you type, including showing you a snapshot of your calendar as you discuss making plans with contacts.
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Apple Music has also been redesigned as part of the update, having been criticised for being confusing when it launched last year.
The new software will also come built in to the new iPhone 7, along with the larger 7 Plus.
