It's certainly is a hot question! Apple has reportedly placed a bulk order for NAND flash chips, which has spurred the rumors that Apple is gearing up for 32-GB iPhone.

DigiTimes has reported that Apple has ordered for 100 million NAND flash chips, mostly from Samsung Electronics, reportedly double the company purchased last year.

Similar report came out in February, when Think Equity Partners reported that Apple has used up Samsung's flash memory supply and has contacted Toshiba and Hynix to deliver more flash memory chips.

The reports are definitely raising the questions - Why has Apple ordered 100 million NAND flash chips? What is Apple going to do with such a large number NAND flash chips? Is Apple preparing for a 32-GB iPhone.

There NAND flash chips are typically used to build 16-GB, 32-GB and 64-GB devices. According to the reports, Apple is preparing for a 32-GB iPhone, which is expected to be launched at Apple's Worldwide Developers Conference (WWDC) in June. However, Apple hasn't issued any official statement about a 32-GB iPhone.