The US Library of Congress, which reviews copyright law every three years, has confirmed that smartphone owners can 'jailbreak' their handsets and install software that hasn't been approved by the manufacturer.
For example, iPhone owners can unlock their phones and install software that's not been obtained from the Apple App Store). They're also allowed to remove a 'SIM lock' in order to switch network. These are two new exceptions to the Digital Millennium Copyright Act, which prohibits most attempts to bypass electronic protection.