Before you update to iOS 11: Be aware that it does not support 32- bit apps. Developers have received plenty of warning, so most apps have been updated, but older apps may be locked out.
To see a list of apps that will not work in iOS 11, look at Settings > General > About > Applications in iOS 10. If you see any apps on that list, be sure to get the latest update from the App Store. If there aren’t any, hold off on installing iOS 11 until you’ve migrated away from those apps. I had a heap of Apps in that List, I deleted the ones that I have not used for ‘years’ & don’t need, and updated the few that I do require. Cheers, Ronni 13-inch MacBook Air (April 2014) 1.7GHz Dual-Core Intel Core i7, Turbo Boost to 3.3GHz 8GB 1600MHz LPDDR3 SDRAM 512GB PCIe-based Flash Storage macOS Sierra 10.12.6
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