For Sprint, the launch of the iPhone 4 and iPhone 4S on their network brought record sales in just half a day. Fared Adib, Sprint Product Chief, issued the following statement:

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.

With new and existing customers invited to purchase an iPhone and Sprint offering unlimited data plans starting at just $79.99, it's not exactly a hard sell for those looking to get into an iOS equipped device.