From Seo Wiki - Search Engine Optimization and Programming Languages
Upsnap is the name of both a mobile-oriented search engine and the company that runs the search engine. Upsnap developed a patented method of accepting queries and producing results via text messaging, aka SMS. The company employs an intelligent query search engine to process text queries sent to the number 2SNAP (27627) and quickly returns the relevant info that the user has requested in text form.
With 4-1-1 directory queries, the user is also given the option to receive a free call-connect via a VOIP bridge. They generate revenue via a pay-per-call model, analogous to the pay-per-click model of internet search.