Pico Translate is an application for Symbian^1 and Symbian^3 phones that provides a convenient mobile frontend for the Google Translate service.
Simply select the "From" and "Two" languages between which you want to translate, enter or paste the words or text to be translated and have the application translate it for you.
Pico Translate is Flash based and it currently has some restrictions compared to the online service: there is no translation of web pages and not all languages are supported, but it's still nice to have it directly on the phone. And when you need the missing functions or languages, you can always simply open your phone's web browser and use Google Translate directly...
Notes: this application requires Internet connection and gets translations from the Google Translate service, so it consumes some data traffic. Please also note that Google Translate does not guarantee that the translation is fully correct or accurate.