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As with the ringtone, the notification tone for the SIM cards can be set independently of each other; in addition to many standard tones, no separate notification tone can be added on the Samsung device.

Android 11 | One UI 3.0
Step 1: Tap on  Settings
Step 2: Tap on  Sounds and vibration
Step 3: Tap on  Notification sound
Step 4: Choose a  SIM card   (Dual SIM)
Step 5: Set a  Notification sound
  1. Tap on Settings
  2. Tap on Sounds and vibration
  3. Tap on Notification sound
  4. Choose a SIM card (Dual SIM)
  5. Set a Notification sound
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Samsung Instructions