GOWriteME is GO SGF editor/viewer for phones (more generally for any Java MIDP-2 devices).
GOWriteME can be used to
Record, edit and save games
Replay commented games
Solve go problems
Download (commented) games from internet
Send games to own mailbox by email
GOWriteME SGF supports includes
Full game information
Variation vieweing
Stone and variation editing
Viewing for most of common SGF4