Users of the Apple iPhone (and iPod Touch) are advised to upgrade these devices to the iOS version 4, which was released by Apple on June 24, 2010. This major software release addresses and corrects numerous security threats to users of iPhones. Users are advised to implement this update as soon as possible.
It is necessary to connect your iPhone to a computer with iTunes. The iTunes application is then used to install the iOS update. Additionally, over 100 new features are added with the update. For additional Apple Security Update information, see http://support.apple.com/kb/HT1222.