Up to 999 speed dial numbers can be added on the Samsung device, with the number 1 always reserved for the voicemail, and the speed dial number can be either a stored contact or a phone number.

Android 10 (One UI 2.0)
Step 1:  Open the  Phone App
Step 2:  Open the  Menu
Step 3:  Tap on  Speed dial numbers
Step 4:  Tap on the  Speed dial number  to choose a new number
Step 5:  Choose desired  Speed dial number
Step 6:  Enter a  phone number  or tap on  contacts
Step 7:  Choose desired  Contact
  1. Open the Phone App
  2. Open the Menu
  3. Tap on Speed dial numbers
  4. Tap on the Speed dial number to choose a new number
  5. Choose desired Speed dial number
  6. Enter a phone number or tap on contacts
  7. Choose desired Contact

Samsung Instructions
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