OALD - learn English on your windows phone. The program has a large word database which will help you in learning a language, there are also a large supply of examples of pronunciation of British and American language. 

Features:

• British and American pronunciation
• 116 000 sound samples available for download to your device
• Clicking on any unfamiliar word in the article find out its interpretation
• display settings transcription, usage examples, illustrations, synonyms and other details of the menu My View
• integrated thesaurus contains thousands of synonyms and antonyms
• full-text search will help you find words even in examples and phrases
• Dictionary displays similar in spelling words with typos
• Create your own list of favorite words
• search History of last 100 words