Apple has announced that its newest iPhones — iPhone 6 and iPhone 6 Plus — received more than four million pre-orders in the first 24 hours of availability. According to Apple, that’s a record number of pre-orders, though there have been numerous reports of customers ordering each of the new iPhone sizes intending to return the one they don’t want. In any case, the company notes that demand has exceeded the pre-order supply, “and…