As you can see here, the mother board of the iPhone is particularly crowded.
The place to put the flash memory is tight and does not allow for two chips to be placed, contrary to the iPod Touch where the telephone and GPS chips have been removed and thus there is more place. This is the reason why the memory size of the iPhone from time immemorial was lower by half than that of the iPod Touch.
The rumour implies that the next device will be offered with a maximum capacity of 32 GB. An advertisement made by Samsung is thus falls appropiate. They announced to have put in production the first chip of movi