You can copy the files (.jar) to your phone, save it in the games or applications folder. You can also download the JAVA file to your phone in the download or a new folder then press install.
hi is my E-mail I know a lot about the phone K770i
my name is LAITH
If you need help
Get a usb cable ..
plug it into side of your sony ericsson k770i
plug it into a usb port into computer ..
put it into other folder..
unplug your phone from the computer
go onto file manager.. by goin to menu and its the 3 row down on the left
scroll down to other
and then click on it and install
and then when it sais where do you want to put it.. put it in games
when it has finished go onto your menu screen again .. go onto entertainment
scroll to games
click on the game you want to play