Millennial Media has published its quarterly S.M.A.R.T. report, which shows that Apple’s iPhone has been at the top of the smartphone platform for three years running when it comes to mobile advertising, at least. The iPod touch and iPad both ranked well in Millennial Media’s list, also.

[ad#Google Adsense 300×250 in story]Millennial Media’s Scorecard for Mobile Advertising Reach and Targeting (S.M.A.R.T.) is a monthly report that shows trends in mobile advertising based on Millennial Media’s own data. The company bills the report as comprising “the largest data set of any third-party U.S. mobile advertising network.”

For its 50th report, Millennial Media juxtaposed a list of the top 20 mobile phones from 2009 to the same list in 2011. The iPhone was one of the only models that was shown on both lists, and in both cases, the iPhone ranked number one. What’s changed, however, is the percentage – in March of 2009, the iPhone was used to show 5.82 percent of ads; in June of 2011, that number was 16.19 percent. No other device exceeded single digits.

Apple also jumped in Millennial Media’s manufacturer list (all devices, ranked by impressions) from the number 3 spot in 2009 to number 1 in 2011, rising from 11.35 percent to 30.76 percent.

The iPod touch and iPad ranked in first and second place in Millennial Media’s “Top 3 Connected Devices, 2011 Ranked by Impressions,” as well.