Open Settings, and go to Wireless & networks > Mobile network. In the settings section for
SIM 1 or 2 (if supported by your carrier network), you can:
l Enable 4G: Turn on 4G. The 4G switch may be unavailable for your device due to your carrier's
settings. This indicates that the 4G network is enabled by default.
l Enable VoLTE calling: Turn on VoLTE HD calls.
After the setting is complete, select the contact you want to call and touch to make a video call.
You can also touch on the screen during a voice call to switch to a video call.
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