From a US landline, dial 011 for international (like dialing 1 for long distance) then 590 for country code, 590 again for city code, and 29 38 00. All together, that's 011 590 590 29 38 00.

From a mobile phone use the + in place of 011. Most mobile phones generate a + when you hold down the 0 key. So from a mobile phone, it would be +590 590 29 38 00.

33 is the country code for France. I've seen several French-side numbers that use 33 for the country code instead of 590, so that will likely work too.