How do I enable LTE when LTE is not working on 5G phone?

Here is what you can do to fix it.

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Make sure the correct Network mode is enabled. 

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 You are needed to disable 5G connectivity on your smartphone to force your phone to latch onto LTE or whatever network is available. 

Try to do as follows.

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Go to Settings, Connections and then tap on Mobile Networks,
lte-process-1

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Tap on Network Mode,

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Change mode “5G/LTE/3G Auto” into LTE/3G Auto.
lte-process-2

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Reboot your phone and enjoy it!

sunaerang