All geographic area codes in Italy begin with 0. Unlike most countries, to put an Italian number in international format, you do not drop the trunk prefix 0 from the beginning of the domestic number.
Area code 0831, which is +39 0831 (not +39 831) in international format, is Brindisi.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
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