point you to the right direction
http://gbatemp.net/threads/gba-backlight-agb-001.328487/
^ people on this thread should provide you more helpful solution than asking here
I dun think that mobile gaming gonna take over because the whole mobile phone environment is a mess. It's easier for me to go for 3DS or PSvita then going through every available phone choice. Mobile device can be outdated in hardware and lost manufacturer OS support very fast when you are not...
No one seems to mention that the exclusive 3DS gets super mario 3D land and mario kart 7 in bundle with the console.
and there's no other games announce for the console other than those two games comes together with the bundle...