Follow these steps to turn on the vibrate feature on the Razer Phone.
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Go to "Settings" on the Razer Phone.

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Select "Sound".

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Select "Also vibrate for calls".

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Test the phone and see if it vibrates.
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If the issue persists do a hard reset to restart the phone and clear any possible glitches and errors.
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If the issue persists, backup your phone data and perform a factory data reset.