Your iPhone may vibrate for no apparent reason due to several common causes, including hidden notifications from apps or email alerts, certain accessibility settings that enable vibration alerts, software bugs, or hardware issues like faulty charging cables. Occasionally, the phone vibrates when plugged into a charger due to the cable connection. Ensuring your iPhone is running the latest iOS version, checking and adjusting your notification settings, restarting your device, and inspecting your charging accessories often resolves the issue. Turning off haptic vibrations temporarily also helps diagnose the cause. If problems persist, resetting all settings or restoring the iPhone to factory defaults may be needed.
