Open the Settings app
Tap Sounds & Haptics
Under Sounds and Vibration, turn off Vibration options (e.g., Vibration on Silent and/or Vibration on Ring)
If needed, disable vibration for specific alerts under Sounds and Vibration (e.g., Text Tone, New Mail, Calendar, Reminders)
To stop haptics system-wide, turn off System Haptics (if available)