Apple [AAPL] will be releasing iOS 4, formerly known as iPhone OS 4.0 on June 21. It will be a free upgrade to all users. iOS 4 will be made available on the iPhone 3GS, iPhone 3G (with some features missing) and the iPod Touch (not 1st gen model). As previously mentioned, iOS 4 will not be available for the Apple iPad until later this year.
When made available you'll be able to download it from iTunes when you sync up your phone. We are in the process of creating a list of all the features that will be included in iOS4 and what it will bring to your iPhone 3GS and 3G and what the differences are, ie - what will be missing on the 3G version.
Stay tuned and we'll have all the details soon.
