Step-by-step process
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Turn off "Flight Mode" on the Razer Phone.
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Open the app list and select "Settings".

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Select "Network & Internet".

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Make sure the "Airplane mode" setting is off.

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Make sure that the "Do not disturb" setting is turned off.

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Manually check the network connection.
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Under "Network & Internet", tap and select "Mobile Networks".

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Ensure that the preferred network type is "LTE/3G/2G".

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If the issue persists, perform the following:
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Do a hard reset.
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Contact your network provider to verify that everything is okay on their end and attempt to use another SIM card.
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Back up your phone data and perform a factory data reset.
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