Yes, to be able to experience VoLTE, both you and the other caller must have the following:
- 4G SIM that’s been inserted in first SIM slot or the SIM slot with data capability and network mode should be turned to 4G/3G/2G (auto). Your skitto SIM is already 4G, so you don’t have to worry about this step
- VoLTE enabled handset with the VoLTE settings turned on
- Be in 4G network
- Most upgraded version of OS software by your mobile manufacturer