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As with the Start, Browser and Messages app, the default app for Phone can be changed by installing any app designed for making phone calls.

Note: If a display lock is set up, alternative phone apps may not be able to run correctly.

Android 11 | One UI 3.0
Step 1: Tap on  Settings
Step 2: Tap on  Apps
Step 3: Tap on  Choose default apps
Step 4: Tap on  Phone app
Step 5: Set the  Default  phone app
  1. Tap on Settings
  2. Tap on Apps
  3. Tap on Choose default apps
  4. Tap on Phone app
  5. Set the Default phone app
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Samsung Instructions