By You Yunting

A friend asked me a question: why by the latest USA legislature, to unlock iPhone shall be against the law, while it is permitted by law to do so for iPad? This question is complicated on essence, and it actually involves two restrictions designed by Apple on its devices.

On the initial launch of iPhone, the exclusive operating partner of Apple for its new device in USA was AT&T, and therefore it built the capability into the phone so as to ensure only the AT&T would be service network. Later on, as detained a slow internet speed, such a SIM lock was soon been unlocked, and from then on other operator could serve the users with iPhone.