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The E.164 recommendation provides the telephone number structure and functionality for five categories of telephone numbers used in international public telecommunication. For each of the categories, it details the components of the numbering structure and the digit analysis required for successful routing of calls.
To call the number (19) 4001-3579 from a payphone in Piracicaba (within area 19, but outside the metropolitan region of Campinas): 0 XX 19 4001 3579. To call the number (19) 4001-3456 from a cell phone working in Rio Claro (also outside the Metropolitan Region of Campinas, but also in area 19 ): 4001 3456.