We can assign a quick dial or speed dial to contacts on the Xiaomi smartphone. By tapping and holding the speed dial button, the contact is called directly.

Android 10 | MIUI 12.0
Step 1:  Open the  Phone app
Step 2:  Open the  Settings
Step 3:  Tap on  Advanced settings
Step 4:  Tap on  Quick dial
Step 5:  Choose a  q  uick dial number
Step 6:  Choose a  contact
  1. Open the Phone app
  2. Open the Settings
  3. Tap on Advanced settings
  4. Tap on Quick dial
  5. Choose a quick dial number
  6. Choose a contact

Xiaomi Instructions