"This is technically the first Trojan horse seen for the iPhone; however, it does appear to be more of a prank than an actual threat," Cox wrote in a blog post. "The impact of uninstalling the 'Trojan' would appear to be an unintended side effect."
Affected users need to uninstall the Trojan and reinstall affected files, according to Symantec. The risk to users is minimal as they would have to choose to install the bogus package and the site which was hosting it has now been taken offline, wrote Cox.
The moral of the story is, unlocking iPhones can lead to actual damage to the device when installing unapproved third-party applications. This is exactly the scenario Apple CEO Steve Jobs wants to avoid by keeping the iPhone under lock and key.