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Samsung's user interface One UI allows its users to install supported messengers twice. Dual Messenger, for example, installs WhatsApp or Facebook a second time, allowing two different accounts to be used. This makes sense especially when a dual-SIM-enabled Samsung device is present. If desired, the contact lists can even be kept separate.

Android 11 | One UI 3.0
Step 1: Tap on  Settings
Step 2: Tap on  Advanced features
Step 3: Tap on  Dual Messenger
Step 4: Turn On/Off an  Available app
Step 5: Tap on  Install
  1. Tap on Settings
  2. Tap on Advanced features
  3. Tap on Dual Messenger
  4. Turn On/Off an Available app
  5. Tap on Install
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Samsung Instructions