How can you make a phone call from Vietnam to Incheon?

To make a phone call from Vietnam to Incheon, South Korea, first dial the international access code for Vietnam, which is 00. Then, enter South Korea's country code, 82, followed by the area code for Incheon (which is 32) without the leading zero. Finally, dial the local phone number you wish to reach. For example, the complete format would be 00-82-32-XXXX-XXXX.