Advertising company Millennial Media just released their 50th Mobile Intelligence Report, detailing trends in the mobile phone industry based on ad impressions. The survey offered some interesting conslusions about the mobile climate.

According to the new report, iPhone has topped the charts as the number one smartphone model for three years running. In 2009, Millenial ranked iPhone as the top mobile phone based on ad impressions, and in 2011, using the same data model, iPhone still holds the top spot. Remarkably, it is only one of two smartphones to be listed in the top twenty on both reports.

Millennial apparently treats the iPhone as one model, despite the three different versions sold by Apple during that time span (iPhone 3G, iPhone 3GS, and iPhone 4). And yet, every other phone manufacturer has each phone model it released individually listed.

Another set of data is used to highlight the top manufacturers, again based on impressions over this same period of time. In 2009, Apple was third, with just over 11 percent of the market. However, by this year Apple soared into first place with almost 31 percent of the market. Perhaps the chart below, then, is more of an "apples-to-apples" comparison:

GigaOM puilled out some other interesting observations from the Millenial impressions report, all of which show how disruptive the iPhone has been to the industry, including:

- 60 percent of devices now have a touchscreen, compared to only 33 percent in 2009
- All twenty of the top phones are now smartphones, compared to only nine of twenty in 2009
- Android is the leading smartphone OS with 53 percent of all impressions served, while iOS is second with 27 percent

The full report is available from Millenial Media here.

Via GigaOM

Adrian covers daily news and the weekly "Law & Apple" column for Mac|Life.com. You can follow him on Twitter, if you want to.