Apple has released the final version of iOS 4.3.1 for their iOS devices. This is a minor update focused at fixing bugs and security updates on all iOS devices.
This update comes less than a month since the release of iOS 4.3.1 which followed iOS 4.3 which was released early in March.
Users can get this update simply by connecting their devices to iTunes 10.2.1. When prompted click Download and Update (Download and Install on Mac) to get the latest iOS firmware for your device.