OnePlus
Turn Call Vibration On or Off auf OnePlus
OxygenOS treats ringtone sound and vibration as two separate settings under call notifications. That is why a call can vibrate even after you turned the ringtone volume down, or stay completely silent even though the ringer is on.
The setting sits inside the sound settings for phone calls, separate from the general notification vibration used for messages and apps. Changing it only affects incoming calls, not other alerts.
Menu path
Open the Settings ➔ Tap on Sounds & vibration ➔ Tap on Phone ringtone and vibration ➔ Enable or disable Vibrate for calls
Turn the toggle on if you want the phone to vibrate alongside the ringtone, useful in noisy environments where the sound alone might get missed. Turn it off if the vibration feels excessive or interferes with the phone lying on a hard surface.
If calls still do not vibrate after enabling this, check whether Do Not Disturb or a Focus mode is active, since those can override individual sound and vibration settings for incoming calls.