The model is changing slowly but keep in mind that TMobile, Verizon, Sprint, AT&T are still incentivised to heavily push the iPhone due to multimillion units th

The model is changing slowly but keep in mind that TMobile, Verizon, Sprint, AT&T are still incentivised to heavily push the iPhone due to multimillion units they've essentially preordered when partnering with Apple http://www.businessinsider.com/apple-verizon-iphone-2013-7 http://www.businessinsider.com/apple-verizon-iphone-2013-7 (NB the numbers were wrong, and iPhone demand and growth keeps increasing, but the underlying business relationship is as described)