A few days ago, Nielsen released a report about the top media trends in 2009. One of the most striking findings, highlighted by MediaPost, was that this was the year that the iPhone and the Blackberry Curve finally overtook the four year old Motorola Razr V3 as the device carried by the most US wireless subscribers.

Ultimately, it took the iPhone and the Blackberry Curve a little over 18 months to become Razr killers.

In a way, this isn’t surprising news. Unless you’ve been living under a rock since the first version of the iPhone came out in June 2007, or perhaps even if you have, you’ve heard a lot about it. The Blackberry Curve 8300, the #2 phone according to Nielsen, has also been a popular standby for RIM, and has also been on the market since 2007.

What does this have to do with Convergence Culture? People’s behavior around media is definitely changing, but these findings highlight how slow adoption of new technologies actually is among the majority of the US population. It also suggests that we still have a ways to go before the majority of Americans are being exposed to all of the possibilities of a “three screen” media world.