Android 4.0 or Android 4 Ice Cream Sandwich is a latest version of Android OS


Features include:
Virtual buttons in the UI, in place of capacitive or physical buttons
Separation of widgets in a new tab, listed in a similar list to apps
Easier-to-create folders, with a drag-and-drop style
A customizable launcher
Improved visual voicemail with the ability to speed up or slow down voicemail messages
Pinch-to-zoom functionality in the calendar
Offline search, a two-line preview, and new action bar at the bottom of the Gmail app
Ability to swipe left or right to switch between Gmail conversations
Integrated screenshot capture (accomplished by holding Power and Volume-Down buttons)
Improved error correction on the keyboard
Ability to access apps directly from lock screen (similar to HTC Sense 3.x)
Improved copy and paste functionality
Better voice integration and continuous, real-time speech to text dictation
Face Unlock, a feature that allows users to unlock handsets using facial recognition software
New tabbed web browser, allowing up to 16 tabs
Automatic syncing of browser with users' Chrome bookmarks
Modern Roboto font
Data Usage section in settings that lets users set warnings when they approach a certain usage limit, and disable data when the limit is exceeded
Ability to shut down apps that are using data in the background
Improved camera app with zero shutter lag, time lapse settings, panorama mode, and the ability to zoom while recording
Built-in photo editor
New gallery layout, organized by location and person
Refreshed 'People' app with social network integration, status updates and hi-res images
Android Beam, a NFC feature that lets user exchange web bookmarks, contact info, directions, YouTube, etc.
Hardware acceleration of the UI[57]
Resizeable widgets, already part of 3.1 but new for cell phones.
Wi-Fi Direct[58]
1080p Video Recording for Stock Android