If you can't install games and apps on your phone, try this method :
Connect your phone with computer ( with pc suite or another program), open your phone memory ( usually C: Drive ), open predefjava folder, open games or applications folder ( choose where you want to install games/apps ), on games or applications folder, make a new folder, rename it with your apllication name ( actually the name it's not important ), then copy your .jar file to that folder, also copy .jad file too, if you have it.

c: > predefjava > Games > Make new folder, rename it > copy .jar file

I don't know how to install games/apps on memory card, is there anyone can help me?

Note : my phone is nokia 6255, I don't if it works on s40v3

works on s40 v2 208x208 ???

Maybe, since it's s40v2, but i tried on Nokia 3110 classic ( s40v3 ) it won't work.

Does it works on 5300 240x320???