iOS 9 Feature Preview: Improved security with 6-digit passcodes and native two-factor authentication

At WWDC 2015, Apple announced changes to iOS that’ll improve the overall performance and the security of the operating system. The new iOS 9 now allows six-digit passcodes, up from the four-digit maximum in previous versions of the OS. It also brings two-factor authentication to iCloud, keeping your synced data much more secure.
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