The New York Times reports on an M:Metrics study finding that yes, iPhone users do more internet surfing than smartphone users and mobile phone users. But we already knew that. Over at the M:Metrics site there’s more useful information, like

They [iPhone users] are more likely to be: male, aged 25-34, earn more that $100,000 and have a college degree, than the average mobile subscriber.

The Mark Donovan, a senior analyst at M:Metrics also adds this:

“While the demographics of iPhone users are very similar to all smartphone owners, the iPhone is outpacing other smartphones in driving mobile content consumption by a significant margin,” said Donovan. “In addition to the attributes of the device itself, another important factor to consider is the fact that all iPhones on AT&T are attached to an unlimited data plan. Our data shows that once the fear of surprise data charges is eliminated, mobile content consumption increases dramatically, regardless of device.”

Nice to have a little demographic and analysis in with our iPhone-is-eating-the-mobile-market coverage.