Apple has just released iOS 4.3.2 update for iPhone 4 (iOS 4.2.7 for Verizon iPhone 4), iPhone 3GS, iPad 2, iPad, and iPod touch 4G/3G.
This is just a minor update to fix bugs, DNS issues, fix document viewer, FaceTime issues, vulnerabilities and some battery life woes on all iOS devices.
To update to iOS 4.3.2, all you need to do is to connect your iPhone, iPad or iPod touch with your computer via USB and start iTunes 10.2.1. You should now see a message prompt as shown below. Simply click on “Download and Install” (Mac OS X) or “Download and Update” (Windows) button to get on to the new firmware 4.3.2.
The final version of the last major update, iOS 4.3, was released back on March 10, followed by iOS 4.3.1 on March 25th, 2011.
Direct Download Links for iOS 4.3.2 / 4.2.7 (Official from Apple)