The new policy started Thursday, said Apple spokeswoman Natalie Kerris. Before then, there was no cash restriction and the purchase limit was five per person.
"Customer response to the iPhone has been off the charts, and limiting iPhone sales to two per customer helps us ensure that there are enough iPhones for people who are shopping for themselves or buying a gift," Kerris said. "We're requiring a credit or debit card for payment to discourage unauthorized resellers."
Reselling? As we know from when the iPhone debuted, there isn't much interest in buying iPhones for more than the purchase price. Unless, and this is probably the key, the iPhones are unlocked. That is what Apple is likely trying to stop.