Apple on Wednesday announced the features for the iOS 4.1 upgrade to its mobile operating system. These include a fresh social network, an improved camera and other minor tweaks and fixes. Hackers have already managed to "jailbreak" the system, according to an Internet account. Also, Piper Jaffray analyst Gene Munster said the iPhone's antenna-design issue could cost Apple up to 20% of its potential revenue for the latest version of the smartphone.

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