The country code prefix for calling Côte d'Ivoire is +225.
To make an international phone call, you should dial: "exit code of your country" + "country code of the country you are dialing to" + "the phone number you want to call".
For example: To call Côte d'Ivoire from the USA or Canada, dial: "011 +225 + phone number"(011 is the Exit code of the USA)