The DS lite does not use memory cards.

Yes.

Yes. You can put them on an SD card and simply put the miniSD inside your phone. Another way you can go about this is find a cable that connects your phone to the USB drive on your computer then it should be self-explanatory.

it depends if the phone will take it but if it does u just have to find out where it goes and stik it in

http://www.wikipedia.org/wiki/Transflash Transflash is just the original name for what is now microSD. (Just to be crystal clear not SD, not miniSD, but microSD which are the teeny tiny ones) See above Wikipedia link for more reading.