Free mobile phone WAP or Web upload and download service.
Upload your file.

You can upload any of the following filetypes (max file size = 500 KB):

.3gp, .aac, .adp, .amr, .ani, .avi, .bmp, .cod, .emy, .gif, .imy, .jar, .jpeg, .jpg, .mid, .midi, .mkv, .mmf, .mp3, .mp4, .mpeg, .mpn, .mtf, .n3a, .ngd, .nol, .nqd, .nth, .pco, .pic, .pmd, .png, .rm, .rng, .scs, .sdt, .seq, .sis, .thm, .vcf, .vcs, .vox, .wav, .wbmp

If you upload a Java application/game (JAR file) the upload service creates its own JAD file.
The JAD file is not required.

If you want to know more about how to create a JAD file, see:
Free mobile phone JAR validator and JAD maker.