Google's Android phones continued its march to dominance.  For the three months ended May 2011, it has 38 percent of the US smartphone market share, up from 33 percent in February 2011, according to comScore.

Apple trails with 27 percent, followed by RIM at 25 percent.

Android, ironically, is the youngest OS among the top three.  However, in just a few short years, it was able captured top market position.  Not too long ago, it was RIM that led the field and owned over 50 percent of the market.

The successful execution on Google's part, of course, played a role.  However, the bigger impact, arguably, is the strategic preference of customers.

RIM's Blackberries are secure and reliable with industry-leading battery life. Apple has the most stylish design and arguably offers the best user interface.  Google's Android, on the other hand, offers the most functions and choices.

Users, it seems, opted for freedom and functions.  They are relying on their smartphones to perform more and more tasks.  Smartphones are what PCs were in the 1990s and early 2000s.

Although the Android isn't the slickest device in the market and likely has the worst battery life, users have learned to embrace it nonetheless.