The iOS 9.1 is the first milestone update for the iOS 9 operating system. It's a large update for the iPhone and iPad, both in terms of size and in terms of the features it has on board.
We recommend setting aside some time to get the software downloaded and installed properly, especially if you're coming from something older than iOS 9.0. Our advice is to set aside 30 minutes if you're coming from an older version of iOS 9 and an hour or so if you're coming from iOS 8.4.1 or below. This free time will allow you to monitor the download and installation and handle any problems that emerge during or after the update. We highly recommend doing some testing immediately after the update is complete. Test your apps to make sure they're working properly and that you're still logged in. You'll also want to make sure your various connections are stable and that your battery is holding a solid charge.
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