I have just come across research from Greystripe about how parents let their kids use the parental iPhone. Parental iPhones are key for developers of apps for younger children, who are unlikely to have their own machine. (The typical iPod touch user is a teenager or young man, and the typical iPhone owner is a middle-aged man, according to demographics I reported in an earlier post .)
The research "How Moms use their iPhones" Includes a survey of how the kids use Mum's phone (or "Mom's" since this is US data). 59% of Moms let the kids use their phone. Of these, 41% had bought games for the kids, and 20% had bought educational content. As regards age of the children, 29% of the moms had children between 0 and 4, while 43% had children between 15 and 17. The survey also covered the role of iPhones in shopping (use of the phone to make or email shopping lists, or to locate stores or compare prices and download coupons)
Thanks to @ruhanirabin whose tweet alerted me to these results!