MobiSuDo is a simple SuDoKu assistant program. It let's you enter your own puzzles, write pencil marks (possibilities) and also check for input errors. MobiSuDo does not help with solving a puzzle beyond that nor generates any puzzles by itself.
The program should work on any JAVA enabled phone with a display resolution of 176x220 or larger (tested on a Sony Ericsson k750i).
You can download it here: mobisudo.jar, mobisudo.jad
The .jar works okay without the descriptor (.jad), but you won't see the icon.
Update: Source now available for download from here (mobisudo-source.zip). You're free to use it for any purpose.
Feedback welcome. Send it to vorkronor at gmail.