Judging by the name, the application allows users to edit and add the list of words in their phones for later use in the T9 typing mode. You can also scan text files for words importing from XML-file and transferring them between phones.

Nokia Custom Dictionary is fully operational on the following phone models: Nokia E63, Nokia E71, Nokia 5800 and Nokia X6. Application may have a slight problem on Nokia E72, Nokia E75, Nokia E52, Nokia E55, Nokia N97 and Nokia N97 Mini. On old phones (eg, Nokia N96, Nokia N95, Nokia N95 8GB, Nokia N79, Nokia N78 and Nokia N82) the application has limited functionality.