Although only officially launched some time ago, Apple has released updates i0S 7 operating system, which is 1OS 7.0.2 because of security issues. Reported previously, iOS 7 has a security flaw that allows users break through the security lock screen, then open a number of applications.
In this latest version of iOS, Apple has also added keyboard Greek or Latin which has not been previously installed. Lock screen actually need to keep your device safe from anyone. Therefore, when installing iOS 7, Apple immediately offered to users in order to make a secret code device is not abused others.
To perform the update, you can go to Settings - General - Software Update. IOS 7 update file size is not too big, which is 21 MB.
(CNET)