4. Is it possible to use VoLTE／VoLTE（HD+）service? October 01, 2021 01:46 Updated We are very sorry but JP Smart SIM does not support VoLTE／VoLTE（HD+）service. Related articles 1. How to contact the Customer Support Center? 3. What is the difference between [JP SMART DATA + Voice Call 050] and [JP SMART CALL] sim card?