Apple releases iOS 4.3.2 to fix the Facetime and 3G bug. The Facetime bug caused some users to get a blank or frozen video when using Facetime. This bug is fixed in iOS 4.3.2.
A 3G bug in iPad Wifi+3G models prevented iPad some users from connecting to the 3G network internationally. The bugs will be fixed in the update. To update, simply connect your device to a computer and click check for updates.