not to change subjects but I have put a lot of my time an energy into working on mobile and giving a lot of that information away for free, hence my side when I have free time project
http://mvstreaming.com im always welcoming people to help jump aboard, what im doing it not for money but a lot for the educational of video esp in the streaming area.
Video both downloading and streaming is a huge mess and what works for one person isn't going to work for another. Also a consumer doesn't understand why his mobile wont stream when he can download a small clip (under 500k) .
my last and only advice before thinking of going into mobile is really be carefull, make sure you have your own product or the people who you team up with have a great product and dont charge you an arm and a leg for it. Another thing is a really good marketing budget which people tend to forget. They may sign up for a program or use someone elses tech but well thats only half the battle.
Alot of he major Search engines have PPC for mobile now and well charge anywhere from 5 to 20 cents depending on things so that 1.99 wallpaper that you share with the carrier, technology owner minus the ppc your little pile of pennies gets smaller. This are just things to be aware of, im not trying to discourage anyone from doing this, just be careful.