The new iOS 5 operating system on the iPhone 4S has over 200 new features. The new Notification Centre shows missed calls, messages, calendar invitations, friend requests and more. The camera app can now be accessed quickly from the lock screen, it has grid lines, pinch-to-zoom and touch focus. Photos can be edited from the photo viewer, with crop, rotate, enhance and red eye removal. Other highlights to iOS 5 include iCloud, Twitter integration, iMessage and Reminders.