If Android is so popular, and winning over so many customers, then why does T-Mobile need to bend over backwards to get the iPhone? Why does T-Mobile think it can’t be sustainably competitive without the iPhone?

Excellent point from Business Insider’s post. Why is that? Why a carrier selling “so many popular and successful” Android devices “need” the iPhone? My simple answer: on a device by device basis, they don’t make as much money as they do on the iPhone.