The graphic does shed some light on to how much AT&T has to fork over to Apple for each phone sold; the graphic states that AT&T does not break even until the 17th month of a 24 month contract for heavy data users. This goes to show that AT&T serves the iPhone as a high volume, low margin type device for the carrier.
It should be noted that some of the numbers in the graphic are estimates but they are reasonable estimates based off of trusted sources and Apple's own earnings.
GigaOM has put together an incredible info graphic