Jailbreaking — the practice of unlocking a phone (and particularly an iPhone) so it can be used on another network and/or run other applications than those approved by Apple — has technically been illegal for years. Most jailbroken phones are used on the U.S. T-Mobile network or on overseas carriers, or are used to run applications that Apple refuses to sell, such as Safari ad-blocking apps, alternate keyboard layouts, or programs that change the interface to the iPhone's SMS system and the way its icons are laid out.

While technically illegal, no one has been sued or prosecuted for the practice. (Apple does seriously frown on the practice, and jailbreaking your phone will still void your warranty.) It’s estimated that more than a million iPhone owners have jailbroken their handsets.

Apple fought hard against the legalization, arguing that jailbreaking was a form of copyright violation. The FCC disagreed, saying that jailbreaking merely enhanced the inter-operability of the phone, and was thus legitimate under fair-use rules.