Official Google Translate app for android mobile phones are available to download. This application can be used to translate between over 50 languages of the world. It is very fast in translation but translates the content online so you phone should have gprs/3g/wifi connection available for the google translate app to work correctly. It features dictionary results, text speech, voice input, romanisation, history, favorite translations and other options. The translation is done using the google translate services and is very fast even on slow internet. This is must-have application for android phones. It can work as a dictionary also for translating a word from one language to another.
Download Google Translate app for android phone from market from here .
Note: The application is official from Google and is fully free.