To dial a phone number using a country code, dial 011, and then the country code, the area code and then the phone number. For Canada and Caribbean nations, a caller should dial 1, the area code and then the phone number.
Countries have different digits for telephone numbers and area codes, so it is necessary to verify the codes before calling. It is necessary to contact a service provider to find the details for a particular country. In some countries, the procedure is different. For example, to call a number in Mexico City, Mexico, the caller must add a "1" to the country code. This should appear as 011 - 52 - 1 - 55 - XXXX-XXXX.