Yes, you can enjoy Olleh WiFi by calling customer service in Korea.
Step 1. Get your Wi-Fi address or MAC address ready. It is on your phone setting about your device information.
E.g. Wi-Fi address - F5:32:C9:A0:80:B7
Step 2. Call customer service at 1899-6120 (paid call) and select English or other language.
Step 3. Tell them to activate Olleh WiFi giving your phone Wi-Fi address to the CS team.
Step 4. Now you can enjoy Olleh WiFi on the bus, subway or everywhere provided.