Sprint’s launch of the iPhone 4 and iPhone 4S helped them make company history. From Sprint’s Press Release:

“Sprint today reported its best ever day of sales in retail, web and telesales for a device family in Sprint history with the launch of iPhone 4S and iPhone 4. We reached this milestone at approximately noon CT/1pm ET. The response to this device by current and new customers has surpassed our expectations and validates our customers’ desire for a truly unlimited data pricing plan.”

I wonder what percentage of Sprint’s iPhone customers are existing iPhone users coming from either AT&T or Verizon for the “truly unlimited data pricing plan.”