Wow, I am really getting confused about what is the real problem
You have not signed the MIDlet, right?
The unsigned MIDlet can be installed on 6600 fold and 3120 classic but not on 5310, right?
hmm...
Are you downloading and installing the MIDlet the same way on all phones?
Would it be possible to copy-paste the JAD contents in this thread (change the JAR URL, if you do not want to reveal the location of the MIDlet)
Have you tested your JAD file with JAD online checker?
http://jadcheck.appspot.com/
(courtesy of one of our forum members,
http://discussion.forum.nokia.com/fo...d.php?t=142415)
Hartti