The iPhone has overtaken the BlackBerry as the top-selling smartphone in the US but is still facing stiff competition from Android, Nielsen revealed in new study data today. Apple passed RIM in September and is now estimated to have 28.6 percent of the American market to itself. RIM has now fallen enough that it had 26.1 percent as of November and was virtually even with Android, which climbed to 25.8 percent and is virtually guaranteed to have taken second place by the end of 2010.
