Interesting data showing that Apple has widened it's lead over the 2nd highest selling handset manufacture in the US, Samsung. http://www.loopinsight.com/2013/04/04/apple-widens-its-lead-on-samsung-in-the-us/
Keep in mind this data is relevant to the individual companies and their handset market share. If you include all "Android phones" into a single pot, then Google is still in the lead (even if that lead has slightly diminished).
Apple's doing just fine.