Turn on-off VoLTE or 4G HD Voice for True SMART 4G MAX Series

  1. On Home screen, select [Settings]
  2. Select [More]
  3. And then [Cellular networks]
  4. At 4G LTE improved mode, button on the right is grey (turn off), tap this button
  5. Button will turn green that means it's already turned on, wait a moment for network data improvement
  6. Once it's ready, VOLTE sign will appear at the top center

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