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No more skeuomorphism!
One of the major gripes that users had with iOS 6 and earlier versions were the felt-like covers for Game Center, the leather binder style for Contacts, and so on. This design was scrapped with iOS 7, making everything look a lot cleaner and simpler. No more felt or leather designs, but instead simplicity.
Additional details with third-party access to personal information
As per a controversy in 2012, when apps were uploading vast amounts of user data to their company servers, Apple introduced a feature that formally requests access from the user when they need to access personal data, such as contacts and calendar entries. This has been maintained into iOS 7, and includes microphone and audio privacy technology.
Redesigned, but still easy-to-access settings
The settings area remains much the same. It's still a complex web of different settings and switches, but it's now a lot easier to see what is what, thanks to the handy icons on the left-hand side.