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Disable unnecessary vibrations
Vibrations are useful to enable, particularly when you're working in loud environments — or even very quiet ones — so you can leave your iPhone on silent and receive a buzz in your pocket when a new message or notification arrives. A physical motor spinning in your device causes these vibrations, but this uses up precious battery life. These can be restricted, or disabled altogether.
Go to Settings > Sounds and select whether you want to enable vibration when your phone rings, or if you want it enabled while it is set to silent.