Engadget - Apple's mobile phone, the iPhone, has caused some controversy among users, because of the Simlock and that it's only offered from one service provider. This sparked the hacking of the iPhone, to unlock it for the use with other providers than those selected by Apple. From the 1.4 million phones sold in Q4, Apple estimates 250.000 went to unlockers. To stop this from happening, Apple has introduced a somewhat intriguing measure. The iPhone can not be purchased with cash anymore, but only with credit or debit card, to "discourage unauthorized resellers". Going along with that, is a limit of only 2 iPhones per person.