iPhone 4.0.1 software update, What comes after iOS 4.0?  Nope, it's not the iOS 4.1 but the iPhone 4.0.1 software update
Everyone, even remotely interested in mobile phones, will tell you  that iPhone 4 reception issues aren't caused by software bugs but are a  result of the phone's faulty hardware. However, Apple are still mum on  that matter (maybe today's conference will shed more light on the real  problem and hopefully will offer some kind of solution).
Well, you can at least enjoy the "improved" formula that tells your  iPhone how many bars of signal strength to display. There are also some  other bug fixes brought by the iOS 4.0.1. The iOS 4.0.1 is only  compatible with iPhone 3G  (though that doesn't work particularly well),  iPhone 3GS and the recently launched iPhone 4.
As for the iOS 3.2.1 software update for the iPad, the list of  updates it brings is a bit longer. 3.2.1 is said to improve the Wi-Fi  connectivity, stutter-free videos playback and video-out functionality  will be more reliable (when using an iPad dock connector to VGA  adapter).
Next up is the fix that should enable copying and pasting of  single-page PDF attachments in Mail. Last but not least is Bing search  option, which has been added to the Safari browser.
To get the latest iOS version just plug your iPhone or iPad to the  computer and let the iTunes software do the rest.
http://www.gsmarena.com