Turn on 4G HD Voice (VoLTE) on Vivo V9

  1. On main screen, select (Settings) 
  2. Tap (Mobile network)
  3. Tap a button to turn on (VoLTE HD Call) 
  4. When being in service area and VoLTE is shown on mobile, 4G HD Voice call or VoLTE service is ready to use
  5. What you should know about VoLTE usage
    • must be U-SIM that supports 4G
    • device supports VoLTE service
    • service activation before using
    • being in 4G HD Voice or VoLTE service area

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