VoLTE (Voice over LTE) calls allow calls to be made over the LTE data network than was previously possible over the 2G or 3G network. VoLTE calls not only improve voice quality, but also reduce battery consumption and call setup time. On Samsung devices that support dual SIM, VoLTE calls can be switched on or off for both SIM cards independently.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Connections
Step 3:  Tap on  Mobile networks
Step 4:  Enable or disable  VoLTE Calls
  1. Open the Settings
  2. Tap on Connections
  3. Tap on Mobile networks
  4. Enable or disable VoLTE Calls

Samsung Instructions
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