I'm looking for a link too, we saw it on t.v. maybe 2 days ago. They weren't saying it was $4k MORE than other smart phones, they just laid out the costs over a 2 year contract that were 'typical', it was based on a Verizon plan for 2 year contract. It also *did* include a monthly insurance cost for repair/replacement. I'm assuming they used top tier plans, which apparently most people who get the iphone end up with (whether they start there or upgrade due to overages on lower plans).
I don't find a link to that story, but here's a link from last Feb, and its showing about $3600-$3700+ over the 2 years then. It would be easy to hit $4,000 if you add in the insurance monthly at just $10/month you're just about there.
http://www.steamenginefinancialcoaching.com/2011/02/14/the-real-cost-of-ownership-iphone-4/