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The developer, Greg Hughes, has instead turned to the unauthorized source for iPhone software, Cydia, which is available only on "jailbroken" devices that can run software not approved by Apple. Wi-Fi Sync is available to purchase through the Cydia Store for $9.99.
Hughes told Engadget that an Apple representative told him over the phone that the application was not specifically in violation of the terms of the iPhone OS developer agreement.
"While he agreed that the app doesn't technically break the rules, he said that it does encroach upon the boundaries of what they can and cannot allow on their store," the developer said. "He also cited security concerns."
Wi-Fi Sync allows an iPhone or iPod touch to wirelessly transfer data such as music to the device without tethering it to a computer via a USB cable. It is not supported on the iPad. The current application works with Mac OS X and requires separate, free software to be installed on the machine running iTunes. Hughes said a Windows version of the desktop application is forthcoming.
The developer first introduced the application in late April.
Apple has maintained tight control of the ability of its devices to sync with the iTunes desktop client. Last year, the iPhone maker was engaged in a well-publicized sync spat with rival Palm.
Originally, Palm's WebOS mobile operating system identified itself as an iPod to allow the device to sync with iTunes by default. But Apple released numerous iTunes updates that killed the functionality. The back-and-forth battle continued for months, until the USB Implementers Forum sided with Apple and warned Palm that its actions were in violation of the organization's rules.