The most common reasons an iPhone randomly vibrates include hidden or silent notifications from apps or email alerts, accessibility vibration settings, software bugs or glitches, and hardware issues such as a faulty vibration motor. Sometimes, apps running in the background might trigger vibrations without visible notifications. Additionally, outdated iOS software or incomplete updates can cause this problem. Random vibrations may also occur when the phone is plugged into a charging cable, especially if the cable is faulty. Restarting the phone, updating iOS and apps, and checking notification and accessibility settings can usually resolve the issue.

Common Causes of Random Vibrations:

• Hidden or silent notifications from apps or email.
• Accessibility settings enabling vibration alerts.
• Software glitches or incomplete system updates.
• Hardware faults affecting the vibration motor.
• Faulty charging cable triggering vibrations during charging.
• Rogue or buggy apps causing unwanted vibrations.

Suggested Troubleshooting Steps:

• Check app notification settings and ensure visual notifications are enabled.
• Inspect accessibility settings under Settings > Accessibility > Touch for vibration controls.
• Update iOS to the latest version via Settings > General > Software Update.
• Restart or reboot the iPhone to clear temporary bugs.
• Update all apps to the latest versions.
• Try a different charging cable if vibrations occur while charging.
• Delete any suspicious or recently installed apps that might be causing the problem.

Following these steps usually helps stop random vibrations on an iPhone.