1. From the home screen, tap Settings.
   
2. Tap General.
   
3. Tap About.
   
4. The "Version" number and "Carrier" number information is displayed.
   Note: For additional information, or to update to the latest software version, please visit http://www.apple.com/iphone/softwareupdate/.
   
5. To check for an update, goto Settings > General > Software Update.