For example, an Iowa district court in November 2006 halted all sales of See Clearly Method kits that had been marketed for several years by a company called Vision Improvement Technologies as a way to improve vision through eye exercises.
Jailbreaking is a hack that allows developers to access the file system of your iPhone, iPad, iPod Touch, meaning the root directory. In simpler terms it means that developers can now have access to all the files on your iPhone, iPod Touch, iPad meaning they can create apps that are possible of doing pretty much anything.
Unlocking involves the removal of carrier restrictions on the handset enabling the use of an iPhone with any compatible service provider/carrier. To software unlock an iPhone it needs to have previously been jailbroken. Do I need to jailbreak my iPhone?