Samsung
Change Notification Vibration Pattern auf Samsung
Samsung separates the vibration pattern for calls from the one used for notifications. If you only ever changed the call vibration, incoming messages and alerts will still use the default pattern, which makes them hard to tell apart by feel alone.
To change it, open Tap on Settings ➔ Tap on Sounds and vibration ➔ Tap on Notification vibration pattern ➔ Set the Notification vibration pattern.
You can choose from five built-in patterns: Basic, Heartbeat, Ticktock, Waltz, and Zig-zig-zig. Each one plays a short preview when selected, so you can compare them before confirming.
This setting applies system-wide to notification vibrations. It does not override per-app custom sounds if an app has its own vibration setting enabled separately inside its own notification channel.
If your phone does not vibrate for notifications at all, check that vibration is enabled in general and that the specific app is not muted, before assuming the pattern setting is the issue.

