8 Configuration
8.1 Sound and Alerts
8.1.2 Vibrating alert
Go to Sounds and Alerts (1)/Vibrator (2) The vibrator option allows you two different functioning modes:
Active: Enables the vibrator for your incoming calls.
Inactive: Disables the vibrator.
The first option you will hear will be set by default on the phone. To change the functioning mode, press the navigate by menu keys followed by Accept 
after hearing the desired option.