Apple iPad uses Micro-SIM for 3G

Apple iPad edition with 3G uses Micro-SIM standart. Steve Jobs never said a word about this feature on iPad presentation, which seems pretty strange. Micro-SIM, also known as 3FF or 3^rd generation SIM card, isn’t supported yet by any iPhone or other popular devices.

3FF SIMs were developed to fit into devices that are too small for a regular SIM. Regular SIM-card has a 15 mm x 25 mm size, while Micro-SIM measures 12 mm x 15 mm. It is still not presented in North America, but T-Mobile and AT&T inform that negotiations to get them are on their way since these companies support the iPad with different data plans.

But what is the reason of making Micro-SIM support in iPad? Maybe it is necessitated because of a lack of space in the device that already has a double size of an iPhone? Also it is very likely that Micro-SIM will be integrated into the 4^th generation iPhone, and then what would Apple do with all that extra space?