IOS 5

iOS 5 is a version of iOS that was released on 12 October 2011. There are seven betas of iOS 5.0 that have been released.

Setup
Devices can now be set up, activated, and configured without connecting to a computer.

Siri
Siri, Apple's voice assistant, has been added with this release for the iPhone 4S.

Notifications

 * Notification Center has been added, which displays recent notifications.
 * Notifications will now briefly appear at the top of the screen as banners.
 * Notifications can be viewed from Lock Screen.

Camera and Photos

 * A shortcut to the Camera app has been added to the lock screen, which can be accessed by double-clicking the home button.
 * The volume buttons can now be used to take a picture.
 * An option to enable grid lines has been added.
 * Camera face detection now highlights all faces.
 * Editing tools have been added to the Photos apps. These include:
 * One-tap enhancement
 * Crop and rotate
 * Red-eye removal

iMessages
The new iMessages app has several new features, such as:


 * Read receipts
 * Group messages
 * Encrypted messages
 * Unlimited text, photo, and video messages

iCloud
iCloud has been added, which replaces MobileMe.


 * Music, Photos, Documents, Apps, Contacts, and more can be synced in iCloud.
 * Apps and Books now have purchase history and can be automatically updated.
 * Find My iPhone allows users to track their devices.

Settings

 * System updates can now be installed via Settings.
 * Several new accessibility options have been added.