With new devices from various manufacturers seemingly released daily, it’s really no shock that mobile browsing is at an all time high. This new high also anchors another multi-million dollar industry: mobile advertising, which begs the question: “Which OS makes the most on impressions?”

According to Millennial Media (who did a 5-month study) Android OS is poised to overtake iOS in this sector, so much so that last month they were tied for smartphone ad market share as well. Surprised?

Although this chart isn’t detailed in that it doesn’t include: specifics on which devices are actually being used and on what carrier, the truth is in the numbers. The fact of the matter is that iPhone still leads the pack despite Android OS’s rapidly growing presence, but how long can they hold on to this lead? Only time will tell.