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To call Uruguay from Argentina, you dial the international access code 00, the country code of 598, the area code without the initial zero, and the local number. To call locally, dial the digits (Colonia's numbers have five digits) without any prefix (the prefix in Colonia is 052).

To call Brazil from Argentina, dial the international access code 00, the country code of 55, the area code without the initial zero, and the eight-digit local number. To call locally, dial the eight-digit numbers without any prefix. The area code for Foz do Iguaçu is 45.