Who do you believe? AT&T? Or, SlingMedia? Ars reports that AT&T approved a version of the Sling Media player for the iPhone to run on AT&T’s 3G network:

“Sling Media was willing to work with us to revise the app to make it more bandwidth sensitive,” AT&T Mobility CEO Ralph de la Vega said in a statement. “They made important changes to more efficiently use 3G network bandwidth and conserve wireless spectrum so that we were able to support the app on our 3G mobile broadband network.”

Sounds like a nice little relationship you’ve got going there, Ralph. What does Sling Media’s John Santoro say?

“We didn’t change anything,” Sling Media’s John Santoro told Ars. “AT&T never discussed any specific requirements with us.”

It’s so difficult to know who to believe these days.