Samsung
Change Call Vibration Pattern auf Samsung
Samsung phones vibrate for calls using a single default pattern unless you change it manually. This setting sits apart from your ringtone and from notification vibrations, so adjusting one does not affect the other.
To pick a different pattern, go to Tap on Settings ➔ Tap on Sounds and vibration ➔ Tap on Call vibration pattern ➔ Set the Call vibration pattern. You will see a short preview list including options like a heartbeat rhythm, a knocking pattern and a waltz-style pulse. Tapping any option triggers an instant vibration preview, so you can compare them before confirming.
When this setting does not help
If your phone does not vibrate at all during calls, check that vibration is enabled globally in the same Sounds and vibration menu, since a disabled toggle overrides any pattern choice.
Also confirm that Do Not Disturb or a Focus mode is not silencing calls entirely, as these features can suppress both sound and vibration regardless of the pattern selected.