To call using your current long distance carrier please dial as follows

011 + Country Code + City (if applicable) + Local number

Italy country code: 39

International City Codes for calling Italy

Italy city code:

Bari 080

Bologna 051

Brindisi 831

Cagliari 070

Capri 081

Catania 095

Como 031

Florence 055

Genoa 010

Milan 02

Modena 059

Naples 081

Padova 049

Palermo 091

Pantelleria 0923

Perugia 075

Pescara 085

Pisa 050

Pompei 081

Portofino 0185

Reggio Clabria 096

Rome 06

Sondrio 0342

Sorrento 081

Taranto 099

Torino 11

Trieste 040

Turin 011

Vatican City 06

Venice 041

Verona 045

Vicenza 0444

I hope this helps.