Nielsen's latest statistics for the U.S. smartphone market in June show that current trends are firmly in place.

Google's Android operating system (OS) slightly widened its lead to 39 percent of the market share.  Apple's iOS is firmly in second place with 28 percent and RIM's BlackBerry is down slightly to 20 percent.   Microsoft phones have 9 percent of the market share.

RIM, with its email-centric BlackBerry, once owned over 50 percent of the smartphone market just a few years ago.  It first lost its lead to the Android OS and settled at second.  Then, it ceded its second place to Apple's iOS in 2011.

RIM still holds the advantage in email communication and battery life, two features that gave it success in the first place.  However, it has missed the big trends in the smartphone industry.

RIM apps never gained critical mass and the company arguably offers inferior tools to developers.  Meanwhile, apps are one of the most important features for the Android and iOS.  Moreover, the Android and especially the iOS arguably offer better user interface than RIM's Blackberry.      

RIM and Apple manufacture their own devices, so their market share for smartphone manufacturing is the same as their market share for smartphone OS.

For Android and Microsoft OS, HTC is the leading manufacturer, cranking out 35 percent of Google phones and 66 percent of Microsoft phones. 

Below is a Nielsen graphic presentation of the data.