ChaCha mobile search uses paid human guides to answer questions sent via SMS text message in conversational English. The service matches queries by sending them to the most knowledgeable guides in that topic, who then answer back via text message.
The mobile search model is now used for ChaCha's desktop queries as well, whereas ChaCha's original model used human guides to search with users in a chat-like session. The previous model was discontinued in favor of the universal mobile search model in April 2008. The new model also includes a voice search service that can be queried from a mobile phone via a toll free number (800.2CHACHA). The standard SMS text id is also 'CHACHA' (242 242).