if you use Hilton AMEX you receive 6 points per dollar with Telecom/Cellular spend.
Off topic, but I was looking at the new Razr M and I note Wirefly and LetsTalk have some interesting portal points/cash back. For instance United Mall states 1600 miles flat for phone purchase with plan at Wirefly. No points for accessories purchases. I don't believe either of those retailers though sell the iphone.