The first version of the next operating system for the Apple iPhone has been released to developers.
iPhone OS version 3.1 is available for software developers to download to enable them to build compatible applications.
Version 3.0 of the software was released on 17 June and has been taken up by three-quarters of iPhone users, according to iPhone software maker Tapots.
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Tapbots monitors hits made on its server as iPhones access its software and identifies which OS the iPhone making the hit is using.
The latest iPhone was launched on 19 June.