Open
Settings, and go to Wireless & networks > Mobile network. In the settings section for
SIM 1 or 2 (if supported by your network provider), you can:
Enable 4G: Turn on 4G. The 4G switch may be unavailable for your device due to your network
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provider's settings. This indicates that the 4G network is enabled by default.
Enable VoLTE calling: Turn on VoLTE calls.
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Enable Wi-Fi calling: Turn on Wi-Fi calling.
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Dialling
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