The basic mgo software (http://www.getjar.com/products/4268) is a 2-Player Go software featuring boards from 19x19 to 9x9, loading/saving matches, reviewing games, counting scores etc.
This version, called mgo_x extends mgo by the SGF export and import feature, which means that you can save your games in a file format, every Go software can use.

This is the 0.8.6 release of mgo_x

Your devide must fulfil the JSR 75 (File Connection) specification. If it does not, there is mgo (without the "_x") which has the same features except exporting SGF files. It is available at http://www.getjar.com/products/4268/mgo

All releases (with sources) available for download on the mgo homepage: http://www.mobilego.org