Millennial issued its June Mobile Mix report Friday morning, and it paints a picture that is very similar to May. Android was once again the most popular smartphone operating system in the month of June as it ticked up one percentage point to receive 54% of all impressions served by the Millennial Media network. iOS lost a point to fall to 26% while RIM shed two points to fall to 15%. Symbian and Windows Phone each gained a point to account for 3% and 2% of the impressions served, respectively. Of note, however, Windows Phone usage was up 31% quarter-over-quarter and BlackBerry OS usage was up 29% over the same period. Apple’s iPhone was still the top device Millennial saw in June with a 16.19% share, nearly triple the BlackBerry Curve, which was the second most popular device at 5.57%. The Motorola DROID filled the No. 3 spot with 2.95%, and the Samsung Nexus S and current-model BlackBerry Bold rounded out the top-5 with 2.71% and 1.99%, respectively. Apple was also the top vendor in June, as its devices accounted for 30.76% of Millennial impressions. Samsung was the No. 2 OEM with 14.94% and RIM held the No. 3 spot with 11.76%. Additional charts outlining more key data from Millennial’s Mobile Mix report follow below.