iOS 4.0.1 Available via iTunes Now

iOS 4.0.1 for iPhone 4, iPhone 3GS and iPhone 3G is released by Apple today. iTunes will notify you to update your iPhone to iOS 4.0.1 when you open the software.

The only change in iOS 4.0.1 update package is "formula to determine how many bars of signal strength to display".

iOS is Apple’s mobile operating system developed originally for the iPhone, and later deployed on the iPod Touch and iPad  as well.  The latest version of iOS is 4.0.1.

iTunes is the interface to manage contents of iPod, iPhone and iPad. It can be downloaded from here: http://www.itunes.com/download.