In the US market there are now more female smartphone owners than men according to recent data from Compete (n=535). The percentage breakdown of women to men is 53% to 47%. Men were early adopters of smartphones and now women have more than caught up.
Indeed, while men are a valuable audience target in mobile, the "smartphone mom" may be the true prize for marketers.
Smartphone Owners: Men vs. Women (US data)
Compete also released some other gender breakdowns, such as smartphone activities. Men watch more movies on smartphones, while women do more of almost everything else:
Smartphone Owners: Activities by Gender (US data)
It's not clear that there are any immediate tactical takeaways from this, except that targeting smartphone owners of either gender is increasingly important for marketers.
On a related note, comScore released smartphone marketshare data today, showing that Android now how more than 46% US market penetration.