Why does OnePlus 8T not show 5G?

You must have a network provider who provides the VoLTE/VoWifi service on your mobile plan . The VoLTE/VoWifi settings will be in your Sim & Network settings, if its not showing and you have a Network provider that supports it as well as a good 4G LTE signal then try the following to see if this will enable it.

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Is OnePlus 8T 5G compatible?

This phone is unlocked and compatible with GSM + CDMA/4G LTE + 5G networks . With 5G, you can experience extremely fast downloads and streaming content up to 4K resolution. For additional connectivity, you can use Wi-Fi 6 (802.11ax) to access local networks and the internet.

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