According to PAGE Magazine, one should read "Brands New Toy" by Bosse Küllenberg and Christopher Quente from spielplatz.cc

They have a site too:
http://www.brands-new-toy.com


See also:
Moconews: Ads and Marketing

The same scenario - not only for japanese Manga (see below):
Growth in mobile content: women and older folks?

Originally from Moconews:

The number of females consuming ringtones and games grew by 27 percent and 21 percent, respectively, year over year. Corresponding numbers for males were growth of 15.4 percent in males downloading ringtones and a decline of 11.3 percent in the number of males downloading games. Females now account for a clear majority, or 55 percent, of ringtone purchasers. While males still have a higher propensity to download games, the ratio of male to female game downloaders has dropped from 61 percent male in 2005 to 54 percent male in 2006.

Found in Mobile Content Startups: Easy Money

While “mobile content” is a pretty large bucket with which to classify a lot of these companies, the trend isn’t too hard to miss: phone companies are struggling to grow data revenues while the margins on voice are disappearing, cell phones are becoming computing devices, and the growth of wireless broadband is providing the connection. Now all they need is the stuff to sell over the pipes.

How to Save a Wet Cell Phone

Ever dropped your cell phone in the sink, or even worse the toilet? Did you ever leave it in your pocket and run it through the washer? It usually means you have to replace your phone, but sometimes if you're fast you can save the phone.

Wizzit

Via the Economist

See article at Focus