Sprint’s product chief Fared Adib, in an email to Boy Genius Report:

“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.”

This is becoming a familiar chorus. While RIM struggles, American carriers, I can only assume, are tripping over themselves to carry the iPhone.

Update: AT&T is on track to double its single-day activation record.