iLounge has discovered that an upgrade to iOS 4.1 is necessary for FaceTime chats between fourth-generation iPod touch and iPhone 4 units.
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Likely due to the fact that FaceTime on the iPod touch uses an email address to connect to Apple’s FaceTime servers, something that isn’t supported in iOS 4.0.2 on the iPhone 4, attempting to connect to an iPhone 4 user running the older software results in failure to connect message.
Thus, early adopters of the fourth-generation touch will likely find few friends able to FaceTime chat initially, although that number should grow as more and more iPhone 4 users upgrade their device to the latest version of iOS.
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