iPhone OS 4 is now called as iOS 4 and it’s Golden Master Release Candidate is available for download for paid iPhone Developer only. We’ve been expecting since really long and finally it’s out. This beta release of iOS 4 / iPhone OS 4 is a last beta release from Apple and final release which will graduate beta will be out on 21st June 2010.

This new iPhone OS 4 / iOS 4 can be install on iPhone 3GS and iPhone 3G and anyways iPhone 4 will be shipped with this OS installed in it. But iPhone 2G / classic wont’ be getting an iPhone OS 4 / iOS 4 update this means that Apple stopped supporting their very first iPhone which was a revolutionary product of in it’s kind.

This is true that from here on iPhone OS will called as iOS and the latest iPhone OS 4 is now an iOS4. So, from here onwards we’ll call ourselves an iOS Developer.

Well, now one thing is pretty simple to understand that why did they changed the name of OS from iPhone OS to iOS, they wanted to use iPhone OS in almost all of their products in coming days or they’re simply coming up with plenty of new segment devices, in which iPhone OS will be used. Those devices which will not be a phone but will be running on iPhone OS, why not just change the name of OS. If you’re an iPhone developer you know how weird it was to talk about iPad and saying that iPad runs on iPhone OS which was pretty much changed through its UI. So, now we call that the iPad runs on iOS 3.2.

I believe that all the device starting with ‘i’ will eventually have iOS loaded in it, in coming days. This is just what I think. If you’ve something in your mind, do let us know leaving a comment below.

Yep that’s true that whatever we speculated didn’t turned up precisely but yeah, one thing what we speculated and turned up well is that the new iPhone 4 is the same iPhone prototype which Gizmodo covered last month.

The new iPhone 4 has the best things in it for both iPhone Developers and iPhone users. One of the best things about it is its Retina Display with 960×640 pixels. Its screen clarity is just WOW! Above all, we iPhone Developers doesn’t really need to rescale our apps to match this new display quality density as we do it on other platforms like Android where we need to design your app keeping different screen densities in our mind. Whereas, iPhone does it all by its own and what else, it makes your existing app looks really better but if you try and enhance it it’ll look stunning on the new iPhone 4.

All together the new iPhone has lots of great new hardware features added in it. Do return to this blog to get new details on iPhone 4.