Apple introduced iPhone 4, including its functions and processor, to the pubic，while ignored the technical specifications as frequency of the processor and memory capacity.

During one of the WWDC sessions held last week at San Francisco’s Moscone Center, the memory capacity is confirmed as 512MB, which is twice the 256MB found in the just-released iPad with the same A4 processor.

The high memory may explain for why iMovie can apply solely to iPhone 4 rather than iPad or iPhone 3GS.