Maybe a temporary software-related issue prevents your device from vibrating. Try restarting your device and your device should start vibrating.
See the don't know how to restart my device guide if you are not sure how to restart your device.
If the don't disturb mode is enabled, your device won't vibrate nor ring. A simple way to disable the don't disturb mode is to press the Volume plus button and either leave your device in silent mode or increase the volume of the device as much as you prefer.
Note: This tip will work only on mobile devices running on Android v5 (Lollipop) and above.
Maybe your device doesn't ring nor vibrate because of the Airplane mode. If you don't see the signal strength bar, nor the operator's name in the upper-left corner of the screen, but you see a small airplane icon instead, the airplane mode is enabled.
Maybe your device doesn't vibrate and ring because the call barring feature is enabled. This feature blocks all the incoming calls.
You can disable this feature via the call settings or by contacting the carrier (operator) you are subscribed to.
The call diverting feature enables you to divert all the incoming calls from one phone number to another. If you have enabled this feature, you won't be able to receive calls; therefore, your device won't ring or vibrate.
Go to the device's Call Settings and disable call diverting. If you are not sure how, ask the carrier (operator) you are subscribed to for instructions.
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