You DONT need a software to get java apps on your phone, is this a Nokia? if so then install PC Suite > Get the phone connected via usb cable > browse the phone using the phone browser shortcut in my computer > copy the jar file to any of the folders there (Extras or Others) and then play the...
.3GP is NOT an audio format, it's Video and no you can't change or do anything to improve the quality of audio streaming that's just the way it is, try googling and see for other sites!