Using this API, a developer's application can access the China Mobile 139 platform, open the data and its business functions. Mobile Internet provides access to API 139 multi-lingual client SDK, through the SDK, can help developers access to API interface. Developers can access functionality such as returning lists of users and friends, reply to feeds, access photo albums and more. An API key is required and it uses RESTful protocol. Responses are formatted in XML and JSON. The site and documentation are in Chinese.