Google Pixel 3 - Caller ID Image

  1. From a Home screen, swipe up to display all apps.
  2. Tap Photos Photos icon.
  3. Tap the preferred picture.
  4. Tap the Menu icon Menu icon (upper-right) then tap Use as.
  5. Tap Contacts Contacts icon.
  6. Tap the appropriate contact.
  7. If presented, adjust the crop area of the picture then tap Done.