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Helpful answers
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Sep 17, 2015 5:52 AM in response to milan171by Lexiepex,The iOS9 takes approx 1.3GB. But there is more on your iPhone:
Go to Settings->General->Storage and iCloud Storage->Manage Storage. there will be a list (takes a few seconds) where all storage users are with the storage they take.
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Sep 17, 2015 5:58 AM in response to milan171by Ingo2711,If you have a 16GB iPhone, the usable space has always been around 12GB, the reason for that is the different calculation of the storage capacity:
How OS X and iOS report storage capacity - Apple Support
And other devices have the same capacity issue:
size of usable space in base model iPhones following larger iOS 8 updates | 9to5Mac