Dialing code: +239 · ISO code: STP
Search the official phone book of Sao Tome et Principe. In Portugese. Type in the name you're looking for (Nome) and then click Pesquisar. Note: the search doesn't work in Firefox and Chrome (among other browsers) - the Javascript search button seems to only work with Internet Explorer. This is a bug that has been around for some time and still hasn't been fixed.
Tiny business directory - less than 25 companies listed. In English and French.
Directel Yellow Pages for Sao Tome, in Portuguese. Type in who (quem) or what (quê) and then click on Procurar.